So, funny enough, fasteners are the bane of my existence. For example, the female DB-9 connector costs me $50, and the two little jack screws that go on it cost $0.76 each, and I have to buy them in 5,000 piece increments. The little black "Plastite" scews cost $0.36 each, and I have to buy them in 10,000 piece increments. The line for the 8 jack screws is second the most expensive thing on my BOM right now (the DB-9 cables cost more than the rest of the parts combined, but this is because of the manual assembly).