This deal has ended.
Buy.com has the Harry Potter Paperback Boxset (Volumes 1 through 6) for $39.99. Pay via Google Checkout and get a $10 off $30 discount that cuts the price to $29.99 (consider spending $10.01 more: you'd get an extra $10 off since there is also a $20 off $50 discount). The Boxset, one of the top holiday gifts this year, is atleast $32 at other stores and retails for over $50. There is no sales tax (except CA, MA, MD, TN), saving you an extra $2.50 or so off your local book store.