So i'm also making the move to Gainsville, except from CO. The advice i've gotten is to look up Aquatic Gardeners of Florida which is more Orlando based. From having run around here looking for houses, etc, the last week, its not terribly far away.
Aquatropics isn't all that bad....at least by comparison to the LFS's we have in the Denver metro area. From folks I've gotten to know in Denver though who lived in Gainesville - they indicated our best bet is making a drive down to Orlando for plants, etc. There's always trades for those of us living up here