[Centurion2000]

Print up a simple insert of a few pages like an errata bulletin. It saves a boatload of money and requires a few cents in printing costs per book.

Simple enough solution.

[dfwgator]

Even better solution, how about getting eBooks online. You can make changes and they are immediately available. Plus you save on the binding and distribution costs. Ah, but the book companies will never allow it. They've got a nice racket going, why mess with it?