Hi Robin,
There are usually no good rates for holiday weeks cuz they're blackout dates for the specials/codes.
I checked dollar.com for a one day rental from TPA and its $72 for a fullsize. Return is at one of the downntown disney hotels, can't remember which one right now.
The rates are staggering for that week. You could try priceline, I suppose..
Good luck,
Herc