Tower Hobbies sells a 4' wingspaned foam glider for $7 ? the wings are swept back. looks like a jet airliner.
I keep about 3 planes ready to toss around the yard or park in 3 seconds time.

Best frigging glider you can buy!! It can be powered. It will teach you more about flying and balancing a plane than 1 year on any RC forum.

Buy it. The wings can be cut and the body cut, both sanded to any swept wing fighter.

Enjoy flying.