Broken down by item, for electric version of 40 size engine:
179 MOTOR AXI 2826 http://hobby-lobby.com/brushless-axi2826.htm
13.90 MOUNT http://hobby-lobby.com/brushless-axi2826.htm#Mount
102.90 CONTROLLER, electronic speed - Jeti -40 amp with program card http://hobby-lobby.com/jetiblue.htm
139.99ea LIPO PACKS Thunder power 3850 mah 3 cell http://hobby-lobby.com/thunder-power.htm
5.20 PROP, APC 13x8 Electric Flight Prop http://hobby-lobby.com/elecprop.htm
Looks like to go electric, I would need, if I went LiPo with two batteries about $590 and with three batteries about $750 since the motor is 180, mount 14, controller 100, LiPo packs 140 each. And I could fly two or three times in a day without a charge.
That's too much for me!