Amazon.com : Tanzfrosch 8 Pack Roller Skate Wheels with Bearings Installed and 2 Toe Stoppers for Double Row Skating, Quad Skates and Skateboard Outdoor or Indoor Use, 32mm x 58mm 82A (Black) :
Toma 4X Skate Board Wheel with Bearings PU Longboard Wheels Professional Repair Kits Replacement Part Accessories for Outdoor Skating Red - Walmart.com
Wheel Bearings Guide for Surfskating
All About Bearings: Bearings 101 - RollerSkateNation.com