Ever noticed how it the cheapest records always seem to have the higher shipping costs? Maybe its a coincidence. My sense is not many dealers look at the various options open to them. I once contacted a dealer and asked if they could ship it cheaper and they responded by saying if "I" can find a cheaper option then they'd ship it that way and and at that price, like I'm gonna spend time researching USA postal services on their behalf. If it was Al Williams for $25 maybe, but not an average record.
As I mentioned on another thread one dealer told me after winning a record in auction that what they thought should happen is that "we" should get insurance and tracking by me paying another $10 on top of the already $12 shipping cost. So they get peace of mind I don't rip them off by claiming non delivery (they can claim insurance) that I have paid for. As I explained if I wanted to pay extra shipping and import duty I'd buy from a dealer over here or in EU of which at least 4 copies were for sale on Discogs.
Interestingly enough the dealer sent the 45 at the cheaper delivery price with no problems, but they now have another copy of the same 45 up for sale (I wonder how many they have found?) At a set sale of $230 despite being able to pay less for that on Soul Source recentley. $230 is the same average selling price on Discogs, so despite me pointing out that its easier to buy from the UK or Europe at that price they still have gone on and are trying to achieve that sort of price despite the risk of import duty and high postage costs, pretty much sums up USA ebay except for the odd exception you have to work hard for or are lucky with.