That's the first thing I check every morning! I've bought several things from them. (Back Country also has a nice outlet online). You have to check early- often a really good item is sold out when I check at 5:30 AM.

There is also WOOT http://www.woot.com/ which has more electronic type things, a different one every day.

And, I just discovered this morning, WOOT Wine http://wine.woot.com/

I've just seen that today- I think they have the same deal for a week, there. I'll watch it for a while and see what shows up.