Holy cow!
It seems every decent AMD card is sold out EVERYWHERE. I could not find a 7950, 290, 290x or anything else remotely similar anywhere. Prices on ebay are absurd.
After mining for a little bit with my measily 5870 in a desktop, I decided today it was time to build a proper 4-5 GPU rig. Looks like that is not happening. It looks that I could also sell the 5870 on ebay for more than I paid 2 years ago, but it's too profitable to let go.
I noticed the same thing. I went on Amazon to see if there were good prices on a 7950 last Friday (Black Friday). They had them on sale for $199 but all sold out. Damn.
Probably a lot of people are noticing, like we are, that alt coins were getting profitable again.
Also, AMD has a new generation of GPU's. Not sure if that's why the 79* cards are in short supply, but maybe that aren't making them any more.