M6 Bolts
Mokan Fastener - Kansas City - Missouri, 2020 prices:
[2000] of m6x18 1mm thread socket head screws. See https://www.mcmaster.com/91502a166 .05 (5 cents each)
[300] of m6x30 1mm thread socket head screws. See https://www.mcmaster.com/90128a26 .075
[3000] m6 nuts, 1 mm thread. See https://www.mcmaster.com/90591a151. .019
[1000] 6mm x 10 mm set screws, can be Black. Equivalent is https://www.mcmaster.com/91390a128 .0515