Mario’s Left Nut (nice username) is currently holding an auction for six NES Test Center carts (Power Pad, NTF2, Control Deck, Joystick, Port and Zelda) and a SNES Test Center console.
The auction is being held on the NintendoAge forum, and he’s looking for a $1400 opening bid. That’s not a bad price, as the seller recently bought the carts alone for that price, and the complete lot of all six carts like that has sold for higher. Plus you get a SNES test console, always a nice bonus.
Auction Thread Here (Registration may be required to view)