These got pulled from Ebay so I am posting them here. They are boxed in mint, new condition. I tested them at the store before I bought them, but I still don't know exactly what they are; however, I am pretty sure they are a Gameboy Color flash cart/back-up device with a memory card. On the internet, I have found them listed for $50 for the memory card and anywhere from $100-$180 for the unit, and they are also always listed as discontinued/sold out. Both items $75 shipped with insurance to the first person that can Paypal me.
Take care!
I assume I can't attach images, so please pm me and I will gladly send you images of the items if seriously interested.
Thank you!
P.S. I posted pics on a post on the Marketplace forum at AtariAge if you want to see them.