I can help you out for sure...go and get your mother's remote...and tell me the FCC ID at the back. I can almost guarantee that it's:
FCC ID GQ43VT14T
I know that this model is used for the Avalon, Camry's, Celica, Matrix...almost all of the late model Toyota's. Your Camry ones should work perfectly if they have the same ID's. I bought Celica ones from ebay for like $5.99.
You DON'T need to go to the dealership to program the remote...you can find the programming instructions on the web that you can do yourself. Heck, here they are!!!
So how will you prove your trustworthyness in ANY way???