You have $83.97 in physical product on this order, you need at least another $16.03 worth of physical product to qualify for the First Ten Shipping discount.
You can select the "combine with pending order" option during checkout to merge items into this order.
Buggers, I have about that much in my sidecart but it is all 'other publisher' PDFs, and the one physical product (Demon Hunters Handbook) I might buy doesn't cover the needed amount even before my AP discount.