Nintendo 64 Game Cartridges. All tested and working.
 
Details/Prices:
 
Donkey Kong 64 - $40
Super Mario 64 - $40 
Mario Party 2 - $45
Mario Kart 64 - $35
Diddy Kong Racing - SOLD
Wave Race - $15
Banjo Tooie - $35
Namco Museum - $12
Rayman - $30