I have two Gameboy Color systems. They are both mint, like new, with all original packing, box, inserts, baggies, twisties, and original batteries. Greatly taken care of.
I have a complete Kiwi Green System with box and instructions. It has a few small ticks in the screen, but other than that it is in great shape. I'd let it go for $12. Also, I have some games you can choose to buy or not.
Conker's Pocket Tales $7
Mario Golf $8
Pokemon Crystal $10
Kirby's Pinball Land $5
Castlevania Adventure $8