WTB: Game Boy and Game Boy Color parts

[TwinFami]

I want to make a custom Game Boy and a custom Game Boy Color. Problem is, that I don’t want to cannibalize a working, sellable unit and that’s all I keep running across on eBay and various other sites. I’d rather use a yellowed or dinged up DMG and a broken screened GBC for example.

 

I am looking for a rough shape WORKING DMG Game Boy that must have a perfectly working screen as for the mod, I need a working screen and motherboard. Everything else will be replaced. 
 

For the Game Boy Color, all I really need is a working motherboard as I’m going to be using the drop in replacement LCD with a new case, buttons, glass screen lens, battery contacts, pads, and power switch.

 

I would prefer the same seller for both to save on shipping but I’d settle for getting them from two different places. Looking to perhaps spend under $20 for each as my local game shop wants $40 for each fully working and sellable. 
 

Can anyone help?