If your hooked on the cub here's an idea. Get a Sig lt-25 or a Goldberg Eaglet 50 or freedom 20 trainer a .25 sized glow engine and a 4-6ch radio.

Fly the hell out of the trianer then switch the gear to the J-3 that way you can learn with a decent trainer and move to the J-3 for only the cost of the model (mine was 99.00 a couple of years ago)