Best (in that I mean cheapest) place to buy OSX server

[Yoursh]

I'm looking to geta copy of OSX 10.4 server to run on my Powermac G4. I've been surfing around and have only found retail price or prices that were way too low to be legit. There's always ebay, but I'm hesitant to pick up a copy that way in fear of not getting authentic software w/ serial #'s. Since I am looking to use this for home use(ie something to play around with), I guessing I could go with an older version (10.2/10.3), I'm just looking for the best value....any ideas?

Thanks

Edit:Actually, it looks like the features I want to work with are only in 10.4.

[Fleetwood Mac]

I saw one (server 10.4) cheap on Amazon recently..

[Yoursh]

Looks like they got the 10-client version for $50 less then full price but I'm looking for a cheap used copy. I figured with 10.5 coming out within the next 6 months, I should be able to find a reseller that has 10.4 for a decent price. Maybe I'll have to wait till after 10.5's release to find a dirt cheap copy.