Well, let's see....
Scratchbuilt Plane (first one)
Plans from AMA (#149): $11.50 (discount taken for being a member)
Wood to build Plane: $150.00
Tools needed, but not on hand: $20.00
Covering for said Plane: $28.00
Assorted hardware (blind nuts, bolts, screws, ): $10.00
Engine: Already bought and paid for (transplant from broken trainer) $0.00
Replacement Piston/Liner for said engine: $65.00
Radio Gear: Already bought and paid for
Servos: $13.00 (Had to buy one more)
Y-Harness: $9.00
Kit Plane (2 done)
Kit: $79.99
Engine: $69.00
Radio Equipment: $119.00 (flight pack)
Wheels: $10.00
Covering: $28.00
Assorted Hardware: $40.00
ARF (1st plane) Birthday Present
Airframe: $100.00
Engine: $109.99
TX/RX combo package: $149.99
To say nothing about the "little bits of this and that" you need to go with the hobby.
Seeing them take to the air for the first time knowing you built them with your own two hands: Priceless!
Just don't let your wife know!
Enjoy!
Don