The $US100 Montie Gear Y-Fork Slingshot -- designed by Nichols Pennington -- is made of aluminium, with a paracord-wrapped handle and a Thera-Band Gold flat band with a leather pouch. It can throw 0.5-inch ball bearings or .44 cal lead ball.
This is almost certainly illegal in Australia. So think of this picture as more of a ooh-look at this, versus hey, go buy it. Don't get yourself into trouble. [Uncrate]