What kinds of inexpensive wood siding, suitable for a shed, are commonly available in the U.S.? I checked Lowe's and Home Depot, but all they had was a single type of barn-style shiplap. I had expected more of a selection.
T-111 is pretty much the standard for that kind of stuff. What kind of a look are you going for? You could always sheath it with OSB and put anything you want on top of that (vinyl, clapboard, etc.)