 We get these engineering subscription boxes that have been coming for a couple of months and I've just been hiding them from the mail before my kids saw them so they didn't know they were there. And my plan this summer, we'll see how it goes so far, so far so good, is to dole these out a little at a time or I buy a bunch of used books on Thriftbooks in the last couple weeks of the school year and just leave a couple of them out on the table.