This depends on what you're budget is. A larger, established collected BC with decent trunk flare and substantial trunk can be expensive. One of the best suppliers of quality BC stock I've found is Zach Smith at Bonsai South. He collects trees beginning in Feb. They sell very quickly. An email or call to him (extremely great guy) can help get you what you want.
bonsai-south.com
Haven't bought from here, but seems reasonable:
Bella Bonsai Nursery was started on three acres here in Charlotte, North Carolina. A fully NC certified Nursery, now we offer more than 5,000 species of bonsai.
bellabonsai.com
You can find lesser quality and younger collected trees on ebay and etsy, but some are just awful and have large price tags.
You can also find decent sized BC at local nurseries--even in Ohio. They are pretty winter hardy trees in the North if given adequate winter protection and understanding. FWIW, if I were you, I would find a source that gets trees from more northerly locations (like Louisiana/Gulf Coast) as opposed to Florida collected trees. I've found that Fla. trees aren't as winter hardy as those collected in La.--which isn't all that suprising. Fla. trees also tend to have different foliage (more like a cross between Pond Cypress and Bald Cypress) than Gulf Coast BC.
