Gameboy retail color bundle

Product Name: Gameboy retail color bundle
Two Gameboy colors Both in working condition HOWEVER they are fidgety retail and work when they want to, turn it on and it'll work perfectly, turn it off and on again and suddenly A or the Start button don't work. It's hit and miss with both. Screens are a bit scratched up Kiwi Gameboy had corroded batteries and I cleaned it as best I could, tiny amount of residue left, I just don't want to potentially mess it up more. I'll leave that to you pros.