The selection pretty much sucks here. I tried to carry houseplants where I work, but we can't sell enough to justify carrying more than a slim variety of common plants.
It seems those "angel plants" people have the corner on things and every nursery has those particular plants.
Most of my own houseplants were traded for on GW. I like christmas cactuses the best, and I traded for those. I also get some interesting succulents at street fairs, church sales and occassionally even Publix!

"Sucks" is about right. Everyone carries pretty much the same stuff. I have found that Scottsdale Farm out on Birmingham Hwy in Alpharetta started carrying some pretty neat stuff about a year ago. They definitely have some things you don't see everywhere else. (I don't know if they keep the indoor stuff well stocked in the winter or not).

If you are into orchids, there's Peach State orchids up in Woodstock. I haven't been in awhile and its under relatively new ownership. They are hosting a conference in a few weeks.

After these two, I'm tapped. Let us know if you run into anything.