The £100 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.
If you buy this, be sure to be careful with it. It's certainly not a toy and you can cause a lot of damage—perhaps fatal—if you hit someone in the wrong place and the right distance. [Uncrate]