Discount code raises already-insane shipping costs?

Thanks, I've never had luck with YO. Arrogance, you bet.
The denial amongst their management is beyond belief. Check out their prices on peformance parts, say AutoMeter gauges. They're stratospheric compared to Jeg's or Summit. Why? "Summit isn't our competitor." I've literally heard that come from the CEO's mouth. Meanwhile, RockAuto is eating their lunch on ACC carpets (among other parts) with the same denial held up as a defense. They literally believe if you're shopping YearOne, you're not shopping anywhere else. That might've been plausible, if not realistic, back in the paper-catalog days, but since the dawn of online shopping it's a preposterous stance.

Anyone who is selling the same thing you sell is your competitor. How they can't grasp that concept is beyond me. The guys in the trenches know this, for the record. It's the middle and upper management that simply don't understand business.

In their defense, experience has shown that their customer service is second to none. The problem is, who wants to pay that much to find out?

Even harness' arent exclusive to them anymore, I've seen other vendors sell them.
The M&H harnesses (Mopar only) are still a YearOne exclusive. Even M&H themselves can't sell them to anyone but YearOne. It's clearly stated on both their website and in their catalog (print and .pdf). YearOne owns all of the connector tooling and has an iron-clad exclusivity contract in place with M&H. Sadly, they're still the best harnesses available.
Every M&H Mopar harness on the market, regardless of vendor either was, or will be, bought through YearOne. This is not true of M&H's date-coded coils or solid-state IVRs, though.

A friend who is a recent departure from YO bought two wiring harnesses from Classic just to not have to buy them from YearOne, even though YO got most of the money. He's that bitter about the way the place is run. He would know; he was there longer than I by a factor of 10.