First off is the joystick my friend gave me for free.
Church thrift: NES turbo pad $0.50
Salvation Army: HHGTTG on tape $2
Goodwill: Genny Model 2 and Mario 3 Advance $3/each
Library bookstore: Aquaman was $3, and six recent game magazines plus Microserfs brought the total there to $5
Aquaman isn't as horrible as I thought it would be. Also, I looked for a power adapter and RF for the Genny, but didn't find them.