Have you taken a look at No Longer Bound?

Here is a link that might be useful: No Longer Bound

I used to live in Marietta, and bought my plants for containers mainly at a nursery called Saul's. They had a great selection of annuals and tropicals. It's a wholesale nursery and grower. We moved 5 years ago, so I don't remember the directions, but it was off 400. I hope that helps.
Robin

One Sauls location is south on Union Hill Road off McFarland about 1 mile west of 400. Another is located at East Nancy Creek Rd. off Peachtree Dunwoody Road south of Northside Hospital. They sell to Trades only at Nancy Creek Location. Cheap large pots are available at Old Time Pottery on Highway 5 (Canton Highway). Just north of Piedmont Road in Marietta. Sauls specializes in perennials but, have some intersting exotic and succulent plants at the Nancy Creek location. Bobby Saul has some nice pots there for ideas and they sell that easy carve stone for planters also.