I'm assuming you don't want a non-airtight stove that breaks down for packing. It is cheapest to make your own out of galvanized sheet and rivets, then do several burns outside the shelter to burn off the zinc. Other than that, Kni-Co makes a well-crafted packer stove that costs a bit over $100. Four-dog stoves have a very good reputation but are spendy.
Cylinder stoves draw much better than box stoves. Those are easy to make as well from a small stainless container from WalMart or Bed, Bath, Beyond type places.