RCrange allows you to see if a particular scale RC plane is available and where it can be purchased. There are thousands of RC planes to view. 

Civilian Aircraft

Airliners & transport
Civil light aircraft
Civil utility aircraft
Pioneers of flight
Sport aerobatic
Sport aircraft
Sport racing

Military Aircraft

Bomber aircraft
Fighters of WWI
Fighters of WWII
Jet fighters
Jet fighters - multirole
Training aircraft
Transport & utility