For commercial-grade hardware (ANSI Grade 1 or 2) that must withstand high traffic, business-to-business (B2B) distributors are the industry standard.
If you need hardware immediately or want the security of an easy return policy, traditional home improvement stores offer specialized "house packs." where to buy door knobs in bulk
and AliExpress : These are the primary sources for direct-from-factory pricing. You can find basic interior knobs for as low as $3.25 per unit when ordering 20+ pieces, or even lower for massive industrial orders. For commercial-grade hardware (ANSI Grade 1 or 2)
: Their contractor's desk can order large "house packs" that aren't always stocked on the floor. They are often considered the most competitive for "house flip" grade hardware. where to buy door knobs in bulk