Eggy,
I understand and empathize with your frustration. Nils' experience notwithstanding, I think most sellers who post the no foreign bidders stipulation are concerned about running into big hassles with shipping, import /export duties and fees, etc. It's a fear of the unknown in most cases. I've seen (and written to) quite a few sellers who consider that, since the area in which I live is detached by your Country from mine, I live in a foreign country. One seller, whose item I won and who did not specify that only Continental US bidders were welcome, insisted that I make certain to pay him in US dollars when I sent him my address so that he might determine shipping costs! He was somewhat embarrassed and apologized profusely when I reminded him that Alaska had become a State in January, 1959, and because of that fact used the same monetary system he did in Mississippi.
I know for a fact that a lot of those sellers who restrict their auctions to Continental US bidders only post fixed shipping charges and are concerned that they will lose a bit of income because of higher shipping costs to offshore areas such as Alaska, Guam, Hawaii and Puerto Rico. When queried about their shipping methods, most stated that they used USPS Priority Mail. It turns out that the cost to ship that ST .46 of Nils', considering a shipped weight of two pounds or less, is the same to any State in the US of A or any of the territories thereof.
I apologize for the about the length here. This is an ongoing battle for me and others.
Paul