I got one of those Sapphire 5830s off of Newegg while they were in stock. Pretty much everything you need to know about it here:http://www.newegg.com/Product/Product.aspx?Item=N82E16814102878
As you can see, it was $110. I'm asking for 8 bitcoins for total cost shipped. At the current exchange rate, that's definitely a premium, but these things just aren't around cheap anymore. There's one on ebay for around 150, but that doesn't include shipping, you'd have to wait 3 days for the auction to finish, go through the hassle of exchange, etc.
Now, I've upgraded to a more expensive card and, due to power limitations in my own and my wife's desktops (I'm not using dedicated rigs), I can't run this 5830 anymore. It's the least power-efficient of the cards I have, so I'm letting it go.
I've been running it close to non stop for the past 6 weeks at 950 mhz. That's with stock memory clocks and stock voltage. I found that for mining purposes it could work at 985mhz (didn't test any higher), but it was somewhat unstable if I tried gaming on it at those clocks. It generally sat from 75-77c depending on the ambient temperature. I'm sure someone with the right setup, BIOS/voltage mods, etc, could take it up even higher.
It would ship in its original packaging with everything from the box except for 1 6 pin power connector I'm currently using. Other than that, it's like getting one new, except I can guarantee it won't be DOA!
I figure I'll put it up on ebay later if this doesn't pan out, but I thought I'd give y'all first crack at it.