Cheap 2inch footballs
I have no clue if this was discovered before, and I'll gladly remove it if it has. I found a nerf pocket vortex clone on evike for $2.50 a piece http://www.evike.com/products/38596/. They also have two inch foam balls in a bulk of 12 for $6.50 http://www.evike.com/products/38759/. Not a bad price for a good quality clone.