That is my experience too, although most people that I contact do ship when I say that I live in the UK and that it is because they have had problems with selling to some countries that have slow postal services.

The cost of shipping now though does mean that I don't buy many lower value chips, and duty charges make the higher value ones more expensive, so it has to be a bargain to make it worthwhile but there are some out there - helps now that I have decided on specific areas to collect which means there aren't too many chips in my price range that attract my attention