That's my experience.
I have a great record shop two blocks from home, cheap and well stocked so I buy by mail only the stuff I don't find there.
I won several MBS on Ebay, all sent via USPS, "used cd" as content, never payed a euros, BUT, because of that, italian lazy postmans simply left the box inside the building doors, near the mail boxes, so I lost the Giuffre set.
Since then I avoid this cheap, but dangerous way of shipping.
No tracking number, no way to check the shipping, only waiting and hoping!!!
I ordered several stuff from Mosaic and Acoustic Sound and I had to pay the handling and Vat, BUT because I had to pay, the service is faster and safe.
I tend to order more items saving on shipping cost and, in case of Acoustic Sound I have a discount that is up to 10% for ordering more than 1000 $.
For example a Classic Record Lp costs 42 euros in specialized italian high end shop that is more than 51 dollars, Acoustic Sound priced it at 30 dollars, plus 20% VAT at Italian custom and let's say 2 dollar of shipping and handling per Lp on a 1000 dollars order, minus 10% AS discount. The grand total is 35 dollars, less than 29 euros.
Less shippings but concentrated!!!