Don't forget geographic factors. Let's use the Mac ED as an example. One of our MLAers just acquired one, but he lives in Holland, where they're fairly common. In the States, the best way to get an ED is to actually import one from Holland or some other country where they're more plentiful (if one did show up, you can bet it would sell for an inflated price). My ED is a Dutch computer that cost well over $100 US to import.