Every single component of every single product that is made requires energy to create, and shipping to receive/deliver, for every step in processing. Thus, every cent of tax on energy and shipping compounds immeasurably for not only every part, but every part of the equipment that builds the parts!
I propose eliminating taxes on energy and shipping, and offering federal incentives to new energy/shipping startups, to reduce costs and foster competition that drives the prices down.
(I would also suggest establishing a set of Thorium Nuclear Power Plants across the nation, to help reduce energy costs even further. We have the best Nuclear Plant engineers in the Navy who have run plants on ships and subs for decades without one incident, we can use their help to make sure any new plants are designed to be as safe as possible.)