If you do decide to cancel the order, check with jdsperformance.com. That's where I got my MAC O/R H. That was the cheapest place I could find it. Shipping wasn't too bad (a little over a week I think). I LOVE the way mine sounds with the Super 40s.
Yup, I used to sell MAC at my store too. They were awesome for years, then something seemed to have changed. Then BOs were the norm and you would get the "in two weeks" answer everytime you inquired about your BOs. I had some last 2-3 months. We basically became the first line customer service for MAC (and other vendors as well).
What kind of hardware came with the H you ordered?