You gotta sell for lower than refurb. Your storage size doesn’t really matter either considering how easy and cheap it is for someone to upgrade. You also aren’t giving a warranty with it like valve does for their refurbs. People should be selling their used steam decks for 200-250$ regardless of what model. Etched glass maybe a little more but not much.
Get the steam deck starter pack. Vampire survivors, dredge and dave the diver.