Try Cabellas, Joes, or Tractor Supply. You will be looking for slingshot ammunition.
I printed one of Tulio Laanen's Marble machines only to find that all of my marbles are too big for it! I then made some 3d printed "marbles" but they don't have the weight to load in the spiral elevator right. The design is made for 3/8" ball bearings and I would like to have them by may 13th for the Maker faire education day.Does anyone know of a place to buy 3/8" ball bearings around the twin cities? I can order them from menard's website and pick them up in store but it looks like menards doesn't normally carry them. http://www.menards.com/main/tools-hardware/fasteners-fastener-accessories/specialty-fasteners/bearings/3-8-ball-bearings-1-pcs/p-1444440055566-c-12207.htm?tid=-2995175209389124626
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I printed one of Tulio Laanen's Marble machines only to find that all of my marbles are too big for it! I then made some 3d printed "marbles" but they don't have the weight to load in the spiral elevator right. The design is made for 3/8" ball bearings and I would like to have them by may 13th for the Maker faire education day.Does anyone know of a place to buy 3/8" ball bearings around the twin cities? I can order them from menard's website and pick them up in store but it looks like menards doesn't normally carry them. http://www.menards.com/main/tools-hardware/fasteners-fastener-accessories/specialty-fasteners/bearings/3-8-ball-bearings-1-pcs/p-1444440055566-c-12207.htm?tid=-2995175209389124626
Gopher bearing would probably have them in stock, they're just north of university ave and 280. Might not be the cheapest.