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Walmart usually carries grits up to 2000 in the 3-M "Wetordry" brand. It is in the automotive section and not in home repair. Advance Auto and other parts stores carry most grits up to 2000 in 3-M...

A quick Google of your area (Tyler, TX) shows three Walmart supercenters and at least ten auto parts stores. You can find wet/dry sandpaper in the automotive section at Walmart and in the body repair...