Places To Buy Stuff From
Here are a few of the places I have used before when buying R/C airplanes and supplies. You may get a better selection by using Google or Yahoo since there are so many new places springing up.
It is very hard to find kits to build for R/C planes anymore. Almost everything is ARF or out-of-the box ready. If you decide you want to build an airplane from a kit go here first!
Some small field flying kits are offered here.
BSD Micro R/C
Some small indoor flying kits are offered here.
These guys are in Tempe and carry quite a bit of electric flying related equipment and supplies.
They seem to have the same things as Tower Hobbies (if not more) but the website is way better. It's easier to find stuff, once found they have plenty of pictures, etc. The checkout process is very nice and they offer multiple ways to ship an order (OnTrac, FedEx, UPS and USPS).
Good stuff here but the website is quite dated. It was kind of hard to locate things I wanted the last time I tried to order (so I used AMain instead).
Frank's Hobby House
3135 E Cactus Rd, Phoenix, Az 85032
8058 N 19th Ave, Phoenix, Az 85021
4240 W Bell Rd, Phoenix, Az 85032