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.
Yeah, that would be the plan. I did the same thing with my Switch and it just automatically uses it as additional storage without any fuss. Does the Steam Deck do the same thing?
Yes, but shader caches always go to the internal memory, so that will fill up even if the games themselves are installed to the SD card.