I think it's Reaper that I got a campfire set from. Given how many scenes in the typical RPG take place around the heroes' encampment, I'm astonished how long it took me to find a simple campfire.
(Yellow d4s get old after a while. . . .)
Yep, I think that is in one of their Adventuring Accessory sets, II or III?
Grendel has a few camps as well - two tents and a fire
A goblin encampment
And World Works has a small set that includes a tarp being used as a tent, and a cold campfire,
The 'tent' is nice (though I can tell you from Boy Scouts that that sort of tent does nothing to keep out the bugs, and, if the wind changes, the rain

), but the campfire is just part of the tile. The portal and ruins have seen use.
And then there is
Portable Adventuring Kit - Campgrounds, by Penguin Labs
I have never seen this one up close.
I see that the dragon skellie picture didn't make it, so...
And, it may be worth looking in pet stores for aquarium decorations - I have found ruins, treasure chests, and even dinosaur skulls, all for having fish swim around.
The Auld Grump