Wanted Gameboy or SNES ganes

Hello,
I took out my SNES and my son (7) is having a blast playing. We only have a few SNES games and only one Gameboy game (we have the Super Gameboy adapter)
If anyone has some old Gameboy games or super Nintendo games collecting dust I would love to give him the same enjoyment out of them as we did 30 years ago. Not worried if the batteries in the cartridges are dead. I will install new ones in.