I do encourage adopting from a shelter or Rescue. The number of rabbits coming in now will be increasing with post-Easter surrenders.
I see Tampa Bay rescue does a "foster to adopt" program. Sound like a great idea! A really good way for people to see if a rabbit is the right fit for them, before commiting to adoption.
Places like SPCA's and Humane societies also will usually have rabbits. http://petfinder.com
will list them in your area.
The current cage is really a bit too small, even for a small breed bunny - according to the House Rabbit Society recommendations. http://rabbit.org/faq-housing/
Will you be able to allow the rabbit adequete time out of the cage? Or have room to set up a pen attached to the cage to increase the living habitat?