I myself live in Florida and so far I haven't found one either. The only place close that I know of is diaper depot that molicareman has already mentioned.
What I find surprising is that this place is actually in a normal storefront, with a sign reading Diaper Depot, and sells baby and adult diapers. Like... with how much stigma that surrounds adult diapers, they're not afraid to call them what they are and potentially alienate some customers. And the mixing of fetish gear with real baby stuff is just... kinda weird? Like that would turn off parents of actual kids.