I always treat "US con only" as a suggestion. I've had pretty good results when I offer the full asking price, any shipping costs and the 4% paypal fees. I tell them I know it'll be a pain to ship to Australia but I can pay right away. If its a small amount of money I'm prepared to lose it if it all goes pear-shaped but its never happened yet, most astro people are honest to a fault. If its big bucks I try and find their form on CN and Astromart, if its someone with a long and highly regarded history then its unlikely they're going to jeopardise it by stiffing you. My 2 cents.
