The X series is the only one that doesn't have an optical drive (it has no optical bay either which is why it requires a dock or an external bay to attach to the port) That's part of the reason why it weight under 4lbs (and why it feels like a very solid slab-- the case is extremely rigid since it doesn't have to deal with any flex from externally accessible bays)
R, T, G, A series all have optical drives. The ones without a drive specified have CD-ROMs where as the ones specified have CD-R/RW/DVD. It seems to be a java glitch why it isn't showing up.
To get a complete breakdown of every current system available from IBM, look through this pdf (it'll give you every detail right down to pitch, stroke, and size of the keyboard)
ftp://ftp.pc.ibm.com/pcicrse/psref/tabook.pdf
(it's a rather large pdf, but well worth looking through on major purchases like computers-- plus you might see something you like better)
As for the specific model of interest, I'd get the Hardware Maintenance Manual (it may be too technical for most, but I heavily research all my buying decisions) Here's a link to the model (R40) you mentioned:
http://www-1.ibm.com/support/docview.wss?rs=0&uid=psg1MIGR-45899&loc=en_US
As for pricing, I've never had a problem finding the pricing, but traditionally IBM's laptops are bought on purchase orders through reps for Corporate fleets or Government/Military use (my latest ThinkPad was bumped for a Navy Seal order of 500 of my exact model) where you do per unit pricing and not individual pricing. Plus I just looked at the Canadian site and is confusing compared to the US site. With what you're looking at (cost wise), this is probably the best model/package:
part number 3WTE122
(BTW, part numbers refer to packaged solutions where as model number refer to the laptop: ie, 2722-CU2 is the R40 you were referring to and can look up in the pdf above. If you are unsure of which laptop is included with the package, call IBM up or use the online chat and ask for the model number.)
Look carefully for what OS is included, the one above is WinXP Pro (not Home) Also, don't get the Intel ProWireless miniPCI card (the official wireless part of Centrino which seems to have a lot of problems) but either the Cisco/b card (if you demand that security) or the IBM dual-band a/b (or if you can wait a week, the newly announced a/b/g card from IBM based on the Atheros Chip-- under $100 US.) They're all mini-PCI and use the 2 antennas in the LCD. You can get them latter too since the R40 is wireless upgradable and pop 'em in yourself (but you have to use miniPCI's bought through IBM-- it is not cross-manufacturer compliant) For FireWire, get a 800 PCMCIA card from firewireDirect and you'll have both 400 and 800.
Hope this helps... now back to Macs