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Searching for ultra low friction ball bearing with 5/16" bore

Searching for ultra low friction ball bearing with 5/16" bore

Searching for ultra low friction ball bearing with 5/16" bore

(OP)
Does anyone know where I can find a relatively inexpensive ulta-low friction ball bearing with 5/16" bore.  My application demands really low friction under 10 rpm, room temperature environment.  i have tried a skateboard bearing called Bones, Swiss Ceramic @ $15.00 each.  The bearing is ok but my competitors are using bearings that are even better.  Any help on locating a possible source?   

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