TL;DR: Steam briefly showed options to buy refurbished Steam Decks for the following prices:

  • 64gb - $319
  • 256gb - $419
  • 512gb - $519

The steam page has since been taken down, but will hopefully go live officially soon.

Edit: That was quick, refurbished units available now.

    • I have a 64gb with a large sd card. My recommendation is to get a 256gb. You will feel space starved with installing different versions of Proton, the shader cache(?), and the emulated Window’s user folders.

      If you get the 64gb you basically have to get an sd card. If you get bigger then you might not ever have to if you play relatively small games and you don’t mind managing installed games.