I got one go 7800 gtx that bought on ebay for my Dell E1705 (intel 850 integrate graphics) that didn't fit in my computer. I looking for $350 with free shipping US to recover my investment and buy later the go 7900 when available.
You can try ebay that have some cards from $375-425 with shipping or try the auctions and wait 3-5 days and maybe get a good price.
My ebay account is : jorgevalentin2003
I can only accept payment by paypal if you are interested.
E1705 - 2.0ghz - 2gb ddr2 667 - 80gb7200 - intel 850 graphics - wifi -
350 bluetooth - WUXGA
E1705 - 2.16ghz - 2gb ddr 667 - 100gb7200 - go 7800 - intel 3945 wifi -
350 bluetooth - WXUGA - 3yr warranty