Oh, only a few here and there, but that was expected. The paper version exists largely because people asked me for it, and because in some academic circles you've not published a book unless it's an actual "book" (much less "a book by a publisher").

Interestingly, I get kickback from Amazon not just for book sales but for other purchases people made while visiting Amazon via my link. :-) So someone will click on my website link to my book, then get distracted by something else, and wind up surfing over and buying an iPad. And I get the kickback for that! Amazon has a strange business model.