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Amazon [amazon.com] has 100-Count #8-32 X 1/2" Prime-Line Phillips/Slotted Combination Drive Round Head Machine Screws (9003455, Zinc Plated Steel) for $ 3.04. Shipping is free w/ Prime or on $ 25+ or $ 35+ orders (minimum requirement varies by location).

Home Depot [homedepot.com] also has 100-Count #8-32 X 1/2" Prime-Line Phillips/Slotted Combination Drive Round Head Machine Screws (9003455, Zinc Plated Steel) on sale for $ 3.04. Shipping is Free