I figured that out a few eras ago also. But found they was even cheaper depending on size from amazon. Same dealer.HOT TIP! This may be well known, but I haven't seen it mentioned yet. When searching for steel balls on eBay or Amazon don't search for slingshot ammo. Instead, search for utility grade ball bearings. The same size and quantity is usually several dollars less than the ones marketed as slingshot ammo! For example... BCTrade sells 1000 3/8 slingshot ammo balls for $24.95 (free shipping). They also sell 1000 3/8 utility grade bearings for $18.75 (also free shipping). Seems like a no brainer to me!