Balsa USA is great because if you mess up a part they can replace it, plus their kits are really nice. If you have other flying experience I would still go for their Stick 40 Plus. As for Helis, I don't know of anything.
I think that @Joker 53150 just sensed a disturbance in the Balsa force
Most online hobby places will have balsa kits, but sometimes they may not be the greatest quality. Just do your research, read reviews, and ask questions beforehand.