From today's e-mail:
"one day sale.... Enter promo code: SALE82 (then click apply) for 20% off and then enter promo code: SHIP82 (then click apply again) for free shipping. Free shipping applies to standard UPS ground shipments to locations within the 48 contiguous U.S. states only; AK, HI, US territories and international shipments are specifically excluded from this offer. Free shipping is limited to UPS ground shipments under 125 lbs. Offers expire on 8/12/13 at 11:00 PM ET, and cannot be combined with any other promotional offers. Not valid on previously placed orders."