Here are the 20 rarest Intellivision carts. However, pretty much anything but Las Vegas Poker & Blackjack and Major League Baseball would be worth $1.99 complete.

Congo Bongo
Fathom
Spiker! Super Pro Volleyball
Super Pro Decathlon
Turbo
Diner
Stadium Mud Buggies
Body Slam Super Pro Wrestling
Learning Fun I
Learning Fun II
Pole Position
Scooby Doo Maze Chase
Dig Dug
Jetson's Way with Words
World Series Major League Baseball
Hover Force
Mind Strike
Melody Blaster
USCF Chess
Mr. Basic Meets Bits 'N Bytes