During last weekend's gaming con, I found myself at an establishment I don't usally frequent, a coffee-related chain we'll call TarBlechs. After getting my overpriced drink, I grabbed one of those sleeves one gets to protect your hands from overheated coffee-like substance... and realized that TarBelch's current sleeves are partially corrugated cardboard, open on one side. Several more found their way into my coat pockets for modelling purposes, and I may have to raid a nearer TarBlech's soonish for more modelling supplies!
The walls of these native huts are from the cardboard sleeve material, the roof is a disc of heavy paper curled into a cone, then covered in spackle and poked at to vaguely resemble thatch. The green pagan image of TarBelch's corporate godlet can be seen on the back wall of one of the huts.
They're mounted on a used CD, painted black then drybrushed with brown and tan; the thatch got a third drybrush of even paler tan to set it off from the wall.
Total cost: approximately zero, beyond the small sliver of soul one loses everytime one enters a TarBlech's location. I've got another couple of sleeves that will likely be used for a small corrugated iron shed or shelter, or possibly another couple huts.