Hamster or No hamster PLEASE HELP!!!!!?

I don't want to sound like i'm whining but i really want a hamster. i already have a dog and a cat and i love them dearly. This is something i would gladly work for but my mom just says no!!!! i don't want to bug her but i love hamsters. I have already done some research on what type of hamster would be best for me and how Much the hamster and the things it needs would cost and i would pay for it all by myself. but my mom just said that she doesnt lke hamsters and we are not going t get one. PLEASE HELP ME I WANT OnE SO BAD!!!!