First of all, send him a reminder and tell him you want payment within 5 days. If he doesn't pay, open a dispute with Ebay. If he pays, all well and good. If not, at least you will get your fees refunded and can then re-list the item. He will have a non payment black mark against his name
file a cast to get the end of listing fee back .Ebay will charged you 10% of final selling price plus postage .Give the buyer a week say then open case
May raise the cost, I'm unsure it changes the value.
Also I am often amazed at the cost of 'other retailer' books I've bought on the Amazon site, where the international delivery seems to stay at the same price. Consequently I think the affect of a foreign purchase should be spelt out.