Stop on Sanibel on the way down if you get a chance. Its worth the trip just to drive through the ding darling sanctuary. There is a nursery on the island. I bet its expensive, like everything else but at least it supports a good cause.
One other suggestion. About a half hour east of Naple is the Corkscrew Swamp Sanctuary, run by the Audobon Society ( i think ). This is a killer hike through a amazing bald cypress swamp on a boardwalk. Its like stepping back in time and theres crazy birds, plants, reptiles etc. everywhere!
Sanibel Captiva Conservation Fund Native Plant Nursery
P.O. Box 839, 3333 San-Cap Rd, Sanibel, FL 33957
Tel: 239/472-1932 Fax: 239/472-6421
E-mail:
kboone@sccf.org Web:
www.sccf.org
http://www.sccf.org/npn_our_plants.htm
Edited- to insert to plant list. Its seems dated but the list is extensive and really the prices are not too expensive IMO.