I’m always impressed by the variety of items for sale on Ebay. I’ve seen air guitars, chewing gum used by Madonna and even a ghost being sold by a woman who would do anything to convince her son that there weren’t monsters in his closet. One thing I haven’t seen, however, is a sex offender for sale. Yet, later this term, the Supreme Court will hear oral arguments about whether Congress can regulate the commercial distribution of sex offenders.