Not selling Just wondering how much I can get for a 512gb steam deck with a dbrand screen protector on system and a 400gb with over 50,0000+ classic games (roms) on it

I have a 400gb micro sd comes with every game for classic systems like nes,snes,n64,gameboy,gameboy color,some gba,sega genesis,game gear, some ps1, some. GameCube, some wii and wii u and many more games for the steam deck and they all work on emudeck