I use a mail forwarding service so i have a USA address. Also shaunbradleyfan helps a few people out by having things sent to his address and he sends them on.
Some seller dont care and will just send overseas. Some will have had a bad experience with overseas buyers and just tell you to f-off.
I just bought quite a few cards via shaunbradleyfan, and he was fantastic. But there are always other smaller auctions I'd love to put a couple of bucks on that are US only but figured they were too small fry to bother with, never thought about setting up a US account. Does it cost much for the forwarding service? Ive also wanted to buy things off sportlots.com but they only deliver to US addresses.