My MA told me that Mac's not putting out postcards in the US anymore (except for when you get lucky and get one in the mail) because they don't like how they are free items and people go and sell them on Ebay. They think that in Asia, people use them for their own decorative/art purposes, and not to make a profit like the Americans do. This is clearly not the case because all the Mac postcards up on Ebay are from Thailand/Singapore/etc.
Anyways yeah, I've been keeping myself up to date by buying them on Ebay, because I'm crazy. There's been Strange Hybrid, Balloonacy, C Shock, Moonbathe, and Flashtronic.