I have two used Sapphire 5830 Xtreme GPUs for sale. I purchased them on July 22, 2011 from newegg.com. This link is the product:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102946For what it's worth, the performance of the cards under cgminer 2.6.6(win7) is as follows:
Card on the left: 900/400 yields approximately 280MH/s at 73C with 43% fan(1500+ rpm).
Card on the right: 900/400 yields approximately 280MH/s at 73C with 47% fan(1800+ rpm).
Looking for BTC offers. We'll do escrow and I'll cover shipping costs. Reply to this topic or PM me with any questions or offers. Thanks for viewing!