I'm not sure about the taxes - perhaps only random ones are checked and have them added on. I haven't copped any so far.
Nice work selling a softback for that much!
I just get stuff from the uk when it works out that even with postage is included it's cheaper than buying locally. Usually when I manage to find an item that's slipped under the radar.... For small items it's not worth it once shipping is included, but for larger things like dvds it can be ok.