Mega Depot Coupon Codes, Promo Codes, Deals, 40+ Offers + Free Shipping 2019-2020. MegaDepot is a leading national factory-authorized distributor for a select group of prominent manufacturers of equipment, tools and instruments. MegaDepot are more than 500 000 products for professionals in the fields of test and Measurement, Safety, Laboratory, Electrical, Marking and Identification, MRO, HVAC, Welding, Automotive, Communications and Networking, Industrial, Optics, and Software, MegaDepot offers a comprehensive selection of Top Product lines in Hundreds of categories.