I'm not sure camo is the way to go, since it implies furtiveness, like you don't believe you have a right to be there. But if that is the way you want to go, try Cabelas, or Bass pro, they usualy have some camo tents. Moss used to have nice beige, though I haven't looked in a while.

I'm all for the Ray Way. http://www.ray-way.com/tarp-nettent/index.shtml

There are some nice tents. I think a good part of stealth camping is to be in and out before they could ever see you. So I try not to use a standard tent at all.