There are several wholesale nurseries around.
Sun 'something', which is I'd say almost due West of you over close to Gainsville.
MollyMc can maybe tell us about that.
Then the Huge plug nursery over SE of Tampa (So Happy sells their over production on eBay) and American ??? further south of there.
If I can figure out how to unlock the info from my external hard drive I'll get some addresses for you.
They all sell coleus.