Love David Sedaris--agree with others here that he is worth $30...I've actually driven a couple of hours on a school night to hear him talk.
Check out the Esquire magazine site, too...he has several essays posted there (they're a few years old, but some have appeared in different formats in some of his books).
Finally, because he often appears with her, I HIGHLY recommend Sarah Vowell as well. She also has a very distinctive voice that makes her enjoyable to listen to (go to www.thislife.org and look for a program entitled Music Lessons--all band geeks will totally relate to that story!). She's funny, but I would call her a little more political. I've used some of her essays with my students just because they're so well crafted. Look for a book called Take the Canolli.