Discount code raises already-insane shipping costs?

YearOne's been reselling to (and buying from) other vendors for decades, especially the M&H harnesses. Remember the Paddock? A restoration-parts place that went by-the-bye in the early 2000s? They were YearOne's biggest customer, to the tune of seven digits annually. Virtually their entire Mopar and GM catalogs were purchased from YearOne. The Paddock was originally exclusively a Mustang place (hence the name).