BEfore you read all the long winded stuff, this
http://www.ebay.com/itm/Silicon-Ima...sk_Controllers_RAID_Cards&hash=item5b011dc5f7 seems to be a real "grab or bite your as for not doing so" piece. He has more than 10, so other Macrumors users should be able to buy that, too (maybe they should wait, how it works for you

) - you then only have to install the driver (link scroll down my post).
12,-USD
Could you share the brand name or other relevant info? I'd like to find something like that.
For your Quicksilver?
The cards I pointed you at in another thread some time ago will go for 25-30USD. To get a PCI-(X) SATA card for 5-10EUR, you have to look into Ebay from time to time or use the automatic message alert.
Generally just every card with a SIL3124 chip works. + the driver from here
http://www.drivers-download.com/en/downloadlist.php?id=72 (they also have the Mac driver for the SIL3132, I did have the latter only for a PCIe-G5).
At current time the prices have risen a bit I see. PCI cards (35MB/s max) are still cheaper as PCI-X (60-65MB/s), though. I also try to find auctions rather than buy-it-now, because they often go for 1-10,-EUR (1,35-13,50USD).
Here are some automatic searches you can "programme", using the alert message function by Ebay:
The alert for buy-it-now items
1. - at the main page enter search term "SIL3124" or "SIL3132" and select the computer category. (I don't append PCI, PCI-X or PCIe, because sometimes they are named wrong and so you might miss one. If you want to clear it out a bit, then use "PCI" AND in a SECOND run "PCI-X" or "PCIx". Some name PCI-X cards only PCI as well.)
2. the results page builds up
3. - check the box that says "include description" and hit search again
4. - scroll down, at the left site set a maximum price, hit search again
5. - look under the search buton, there is "shipping to" and a blue Zip code. Click on that blue ZIP code and change that to the US, if you use my link. Hit search again
6. - above, about in the middle under the search field, select "only show buy-it-now"
7. - in the same area there is in green "Follow this search", hit that and agree.
Now Ebay will send you an alert to your private email adress and since you have set a maximum price you won't be anoyed buy multiple items showing up in the message.
You can use this link and fit it to your needs (i.e. change to US shipping, set max. price, choose buy-it-now, maybe multiply that with different search terms and finally "follow this search")
http://www.ebay.com/dsc/Computers-T...&LH_TitleDesc=1&_ipg=200&_nkw=SIL3124&_sop=15
Oh, for easyness of comparison, for buy-it-now stuff, I sort the results by "cheapest first", the order in my link will change, once you choose US shipping.
alert for auction-items
- do everything the same, but instead DON'T set a maximum price, just leave tha untouched and of course choose "show onyl auctions", the of course the last step again is "follow this auction".
If you don't want to get alerts, and rather search manually everyday, bookmark and use this link
http://www.ebay.com/dsc/Computers-T...g=200&_sop=15&_nkw=SIL3124&rt=nc&LH_Auction=1 (and important set the shipping to US, you might also want to "dublicate" it by using another search term)
without alert and a wider search term
- reason behind this is a) you will find (odd listings, which will be) much
cheaper and b) you will get 2000+ results for buy-it now (you might want to set the max. price limit here, of course, if you do not gamble on finding an auction for a bundled lot) and like 60 results for auctions, I do not set a max price here again.
- search term: "SATA PCI" (so it will find the PCI-X ones that are often named only PCI, too). You can look at the pictures in the results overview, if it has the long golden Pin row, it is PCI-X, if you don't want to take a PCI version.
- of course, here you would have to scan through the single results and look, if there is a SIL chip on them. (If you concentrate on only the PCI-X cards, while scrolling down and having a look at the pictures, you would not have so much single auctions you have to look for the SIL chip.)
I found, that some people even use Serial ATA or PB3124, it was luck, that I saw them, they came up wwith the "SATA PCI" term, but where in the lower regions of the results page.
other than SIL chips searches
- the LSI or 3ware PCI-X cards are compatible, you have to download the driver at their page. They are often sold used. So when using the term "SATA PCI" term, your eyes to "detect" the pictures that show the typical LSI 3ware card design with the writing "AMCC PowerPC" on the chips (that doesn't mean they are for PowerPC, but that they used a PowerPC chip there, for compatibility you still have to install the driver and not all LSI/3ware cards work, I mentioned the exact series in another thread.)
Here is an example for a compatible PCIe card
http://www.ebay.com/itm/LSI-3ware-9...sk_Controllers_RAID_Cards&hash=item2ed3940329
This btw., is the PCI-X model I have and got it for 7EUR in an auction
http://www.ebay.de/itm/SATA-Raid-PC...60914373869?pt=Controller&hash=item54082c4ced and this
http://www.ebay.com/itm/4-channel-P...sk_Controllers_RAID_Cards&hash=item25902fb3cb (compare both fo US shipping)
Here a 15USD PCI card
http://www.ebay.com/itm/SYBA-SATA-II-NCQ-Host-Controller-Card-/201118392488? or
http://www.ebay.com/itm/S-ATA-II-4-...sk_Controllers_RAID_Cards&hash=item2ed39720a8
all with the SIL3124 chip
Here a 30USD piece for a PCIe G5
http://www.ebay.de/itm/SYBA-Multime...sk_Controllers_RAID_Cards&hash=item27e5a51ae4
You might want to reread this thread
https://forums.macrumors.com/threads/1713461/ (for the recomendations I did)
and this, where there is a more general list with exact namings. Post #19
https://forums.macrumors.com/threads/1650568/
- there is a Highpoint RocketRaid and Adaptec card as well, that is compatible. You may find mentioning of them somewhere.
PS: the SIL3132 card I had for my G5-PCIe (without flashing) has this design, it is sold by many different manufacturers
http://deepapple.com/forum/index.php?topic=44676.0 or better, this one
http://t3.gstatic.com/images?q=tbn:ANd9GcT_a9S4cnoP1wrNFgPfRPRCc-M1QNnGUWwaV8IIN3m7mKkiLO31qlbZkf31
PPS: CORRECTION, I had a part above, where I wrote "I can't guarantee for this one, it has SIL chip, but first ask, if the main chip is the SIL3124 or SIL3132 (I have heard of someone using a SIL3134 with a SIL3132 driver, the last number indicates the number of ports.
6,- USD as an auction (14 USD buy-it-now)
http://www.ebay.com/itm/Dell-PowerV...sk_Controllers_RAID_Cards&hash=item417f16f33d"
The card linked to has a SIL3512 chip. The flash with a Firmtek ROM was done on a SIL3112 and the suguestion by that other forum was, that a SI3114 may work as well and that the last number is the number fo ports.