You definitely want to stick with an authorized 3M distributor to ensure you're getting genuine quality, especially with complex products like respirators or VHB tapes. I highly recommend checking out M-Source. They specialize primarily in 3M industrial supplies (adhesives, abrasives, safety gear) and have a huge online catalog. Their focus on the industrial line means their customer service team actually understands the technical specs, which is crucial if you're buying something like specialized 3M tapes