So i don't have pictures yet as it isn't finished, but ours is 7x3 floor space raised 2 feet, wall height is 3.5-4 feet (sloped roof). We used 2x4s for the frame and plywood for the walls. 5 sheets of plywood is 100 to 150 bucks, probably 50 dollars of 2x4s (we re-used a lot of old scrap ones) and a box of nails/screws (price varies, another thing we had in garage) you can buy tin roofing for another 30 (we're still debating our roof) and a can of paint (varies)
So in short... 300 dollars and pretty darn easy?
There are a zillion plans on this site, but we should have ours uploaded in the near-ish... Future.