I suspect some sellers have a US location--a presence in the US--but their primary suppliers are foreign. I had one sale cancelled by a US seller a few weeks after paying (a foreign coin), the delivery long overdue. When contacted, the US-based person (in somewhat broken English) indicated that the coin "couldn't be found". Eventually received a refund. I didn't quite feel right purchasing the coin in the fist place. The seller didn't have that much up for sale, and the total number of past sales was in the low three digits. Ended well in that I got the refund. I'll try listening to my gut a little harder.