The Slo-V idea is one of the cheaper ways to do it, but aren't you limited to 5 frequencies with the Park Zone stuff? Not good if more than that want to fly at once.

I think keeping it under $100 for everyone will be difficult. If they could share Tx's and chargers, that would help.

My input. Never flown the Frog, but it's an idea....
Plans for the plane:
http://www.foamfly.com/customer/prod...14b453f9e9bf52
Radio gear.
http://www.gwsexpert.com/product_inf...roducts_id=507
Motor needed (I think....)
http://www.gwsexpert.com/product_inf...roducts_id=322

You need to buy foam, but that's relatively cheap and you'd likely need $15 of other stuff like wire, wheels, other hardware....

You could charge the NiMH batteries with the TX charger if you know what you are doing.

Good luck!