Went back to both the inn and the smith and no camping supplies appear in the vendor's inventory to buy. It was working, but suddenly there isn't any more. I left the city, waited a few days, went back and the same result; still not a single camping supply to buy. Tried this a second time still nothing to buy. So, this is pretty much a show stopper. To have to turn around and return to town two or three times to finish a dungeon (walking all the way through the dungeon, the outside area around the dungeon, the intervening forests, and across the town to the inn) would really make the game tedious to finish. I hope there is a fix out there. BTW I have it set on normal difficulty.

Console command

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iroll20s

rest

Wierd. I found all kinds of them, as well as had enough in shops to keep progressing without stopping.

You need to be able to see how many camping supplies you need, when you are in the merchant screen.

Strange, I have never seen them run out before. I have played about 30 hours on Hard and have to buy them fairly often.

Weird, they seem to restock fast, try traveling far a couple of times to let time pass, see if it restocks.

There is no shortage. I get the impression that the OP is resting (camping) WAY too often.