I got one searching with yahoo shopping... toshiba sdr-5002 i think. it was only $200 (including all software). I also bought an extenal usb 2.0 case with a built in cooling fan ($40) so that i could use it with all of my computers. Definitely worth it.
4.7 gig on one side, you can get doublesided for up to 9.7...
Last night I found one with a 8 meg buffer too. Forgot the speed.
I have a link at home. I'm at work now but I'll post it later.