The Hobby Guy has how to make a flying wing on the cheap (not counting some of the electronics)… He writes – “I am always happy to make things from cheap parts, especially when you add up all the money I spend on my hobbies. Building radio control airplanes from BlueCor (Fan Fold) foam board keeps cost down. In addition to being low cost, Fan Fold airplanes are fast to build and easy to repair. This build should take less than two hours, and sans electronics, cost under $5.00. Compare this to commercial kits, which start at $40.00 for a box of foam. Forty Dollars is not a bad price, very good in my book, but you can build eight wings for the same price…” – Link.