In case anybody else would find this useful, I finally found kitchen cabinet handles and a lot of other stuff at these locations:
1) Take bus #9 to You Guan Qiao (油管桥). This market has cheap kitchen supplies ranging from woks and dishes to cabinets and major kitchen appliances. The middle indoor aisle has a limited supply of cabinet handles.
2) Take bus #64 to Shuang Long Qiao (双龙桥). That area has warehouses filled with electronics, cosmetics, and costume shops. A few blocks away in the basement of a really tall building, are lots of little shops that sell kitchen and bathroom hardware (towel racks, cabinet handles, door locks, etc.) My two favorites were: Yong Cheng (phone: 13888023238) and Hong Yu (13759591331). One was the cheapest, and the other had the highest-quality materials. I forget which was which.
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