Isn't domestic postage in the USA incredibly cheap? Would it be realistic to buy components from the east coast and ship them west? This is normal in Australia

Isn't domestic postage in the USA incredibly cheap? Would it be realistic to buy components from the east coast and ship them west? This is normal in Australia, but that's due to the size of the country and the sparse population in some areas. Our prices are a rip-off equally everywhere: https://en.wikipedia.org/wiki/Australia_Tax https://en.wikipedia.org/wiki/Australia_Tax