They don't shed all that much, only when they are blowing coat, which is about every 6 months. I found an old lab of ours to shed more than our Akita's.
I think fostering, even through the SCPA, would be a good option for you. You get your pet fix, you help out the dog, even if it is temporary, and you help out the rescue(or humane society). Now keep in mind that most require you to have a fence and be prepared to fork out some money for shots, spaying or neutering, and for the everyday necessities like food and training supplies(collars, leashes, crates and the like).
If you have any specific questions about fostering, feel free to PM me.
Good luck!