you can pick up a set at any woodcraft store or order them through grizzly imports. there are cheaper wheels out there but i found out the hard way that cheap wheels are just that. the first "good" set i bought are still going strong and the cheap ones ($10. less) i bought after them are already wore out. the cheap ones seem to be made from recycled paper and mine came apart over time. you can also get the good ones from the manufacturer at sharpeningwheels.com

i think grizzly has the cheapest price but i would check out the woodcraft store price and see how much it is to just pick them up and save on shipping.