Ummm... Don't you mean 2600 series m8?
(Yup! I know... typo! And now I can see again, I'll be a terror!) LOL
I recently got a friend here an Asus EAH3850-HTDI-512 (ATI Radeon HD3850 with 512MB DDR3 RAM) for AU$252 (and with the exchange rate now, it's almost the same in US$!
I think I can get an Asus EAH2600PRO-HTDI-512 (ATI Radeon HD2600PRO) for about AU$75 here (give or take a couple $) And a quick look at my catalog shows an XpertVision ATI HD2600XT Super 512MB for AU$143.
If anyone is living in Aus and needs parts etc, let me know.
Cheers!