I am so in as well !
Nothing better than quickly having a new plane for low costs!
I would agree with pgerts that a scratchbuild is the way to go for the cheapest stuff.
Maybe also go for just a 3mm depron sheet and than something more like this :
Parts List:
$3.50 GWS EP Propeller (RD-8043 203x109mm) (6pcs/set)
$7.15 Turnigy 28-22-azj 7A 1400Kv Brushless Outrunner
$11.50 TURNIGY Plush 18amp Speed Controller
$4.16 Turnigy 500mAh 2S 20C Lipo Pack
$2.90 Light Foam Wheel (Diam: 30, Width: 12mm 5pcs/bag)
$2.77 Turnigy 1370A Servo 3.7g/0.4kg/.10sec
$2.77 Turnigy 1370A Servo 3.7g/0.4kg/.10sec
$0.43 Light Plane Plastic Part set (10pcs)
$1.00 Foam Board
This parts list should be easy to modify to some much lower prices!