Sheryl: I ordered from Rob's Violet's (Violet Barn) a couple of times about six years ago and felt their prices were very reasonable and that they do supply very healthy plants but just beware ... the plants are Very tiny in size, at least they were when I used to order. I found that I had trouble keeping them alive without really babying them. I've also purchased African Violets and Chritia's from Bluebird Greenhouse :
http://www.bluebirdgreenhouse.... Although they don't carry Episcia's I found their plants to be decent in size, very healthy and reasonably priced. I got out of growing Gesneriads and although I haven't purchased from them, I've heard rave reviews about Lyndon Lyons Greenhouse:
http://www.lyndonlyon.com/ They apparently ship decent size, healthy plants.
