Matt, you hit the nail on the head. The prices in the US are so much lower, because there is, practically, no wholesale distribution in the United States, B&H and Adorama etc. buy in such enormous quantities, that, the factories, in order to control fixed costs, make "take or pay" contracts, with volume triggered rebates back to B&H etc. Until recently B&H didn't charge state sales tax, let alone a 20% VAT.
I would be willing to wager that film is one of the most profitable segments of these enormous online retailers. Kodak, gave in years ago and cut out there local dealers, Fuji started it and Kodak followed. Direct sales to anyone that met the volume minimum requirements . I remember when B&H had Kodak films "made overseas for foreign markets" "film produced in the USA and spooled in some foreign land" and "Good, wholesome American made, American spooled". B&H joined the Professional Products Network. Dealers, that displayed the 55° F limit sign. And at the same time sold imported goods priced different, came in different packaging etc.
Freestyle started way back buying odd stuff from everywhere and packaging it. Now they distribute Foma products in North America, have their own line of sundries, chemicals etc and have enough education business that they can survive in a virtual duopoly in the US.
Kodak is selling every bit of Ektachrome they can make, thus Fujichrome Provia F is the inexpensive, B&H must have a take or pay contract with Fuji on Fujichrome . A couple years back B&H had a sale on close dated Fujichrome 35mm it was something like 5 or 6 bucks a roll. I filled a corner of my freezer. Now it's 3 times that. Shouldn't complain because without these kind of chicken or the egg, type of contracts, we may not have Fujichrome at all. i.e. Acros.