Academy of Model Aeronautics If you are new to the sport, begin here! For a quick link to join the AMA, click HERE.
Advantage Hobby Good mail order site with reasonable shipping
Atlanta Hobby Cumming store and mail-order business specializing in electrics. Owner, Cliff Whitney, can answer your questions about electric modeling and is most willing to share his knowledge. They are also a good local source for Ultracote/Oracover iron-on covering and Mercury adhesives.
Balsa USA a great site for mail-order balsa. They have everything from sheet balsa, balsa sticks, and shaped balsa to hardwood and aircraft plywood. They also feature a nice line of kits and plans. Check 'em out.
Batteries: The following sites will probably answer more questions than you want to ask!
Radical RC cycler FAQ
NiMH vs NiCad
Roger's Guide to understanding lipo batteries
Boca Bearings An on-line source for model engine bearings
Drones Information on buying, flying and the Federal Aviation Administration
Extreme Flight RC A Cumming based on-line provider of extremely large and/or extremely fast ARFs. You can obtain their address on their website and can pick up your model direct from the warehouse.
The FAA requires operators of unmanned aircraft weighing more than 0.55 pounds (250 grams) on takeoff (including everything on board or attached), and operating outdoors, be registered at www.faa.gov/uas.
Additional state or local requirements may apply. Check your local jurisdiction. The following websites may help you make informed decisions about how regulations impact you: www.knowbeforeyoufly.org and www.modelaircraft.org.
Georgia Model Aviators (GMA) A neighboring club near the city of Cumming
Harbor Freight Tools Good source for inexpensive tools including numbered drill bits
Heads Up RC Hobby Store Great source for electric motors, ESCs, batteries and all things electric. Shipping charges are almost always $2.50.
Hobbytown USA Duluth
Horizon Hobby Mail-order featuring Hanger 9 products and is a good source for Ultracote/Oracover covering material
Omni Models Good mail-order site which operates out of the same warehouse as Tower Hobbies, but with lower shipping costs
Planet Hobby This site offers NoraRossi engines and other high-end (spell that "competition") modeling supplies
Servo City Specialists in servos. Many hard-to-find items and good reference tables for servo specs
Tower Hobbies Good mail-order site with the best website for ease of ordering on the Internet. Great return policy
Value Hobby Great prices on small electric motors, escs and servos.