Great.
I suggest looking on Craigslist for cages... I tried to pick out some listings, but I don't know if these really will fit...
This one would be a great squirrel cage with extra branches and stuff, but I imagine it's a bit too expensive:
http://tallahassee.craigslist.org/pet/2040784046.html
Depending on how long you were keeping her, this might be OK for a little while (I would NOT keep her in there when she's older, but if you do a soft release as an older juvenile it may be ok...):
http://tallahassee.en.craigslist.org...006973786.html
This is probably NOT the intent the seller had of this cage, so she's probably expecting a biggish offer, but still, if she'll let it go for cheapish, with branches and a nest box this could make a great cage for one:
http://jacksonville.craigslist.org/pet/2041029914.html
There's no picture, but it sounds good:
http://jacksonville.craigslist.org/pet/2039973259.html
Great cage! (for not a huge price.):
http://jacksonville.craigslist.org/pet/2037460128.html
...And you can look for yourself...because I don't know Florida cities at all, so I tried to get the closest to you from what I could see from the map, but they're all still about 2 hours away.
So...I'll assume you know the cities close by to you so it'd be easier to find one closer.
Plus, I don't know what is out of your price-range... But yeah, I don't know any free or cheap ones personally. I still think the people on the squirrel board could help you with that too if you haven't joined it yet. (I'm not trying to push it like sponsoring it, because personally I don't like most of the people on there too much- they think it's utterly cruel to have any "wild" animal as a pet, unless I guess if it's SFS's? So, I'm really not welcome there. I just think they have plenty of helpful info pertaining to squirrels...)