They also let you combine the 25% or 30% off coupons which they e-mail out every week this time of year.  Using those two promotions in concert, I was able to buy two omniboo and get a free masterworks.  The three items I bought would have cost me $200 on Amazon, TOW, or eBay, but they came to $100 in my order.  It arrived much faster than B&N orders have arrive in the past, and I had no problems with the condition or any stickers.  I plan to utilize this sale at least twice more in the next few weeks.

FWIW, the three books I got for around $100 were the Invisibles Omnibus, the Millar Wolverine Omnibus, and Iron Fist MM2.  The first of those books alone is almost always over $80, so it's basically like I bought that and got the other two free.