The key to grabbing stuff from the liquidations is to wait. Every week (I think it is a week) they will up the percentage by 10%. That is what they did last time with the first wave of closures. I got a lot of books for 40% off and went back a week later and cleaned up anything else I wanted but didn't care if I got or not at 50%.
They were the best place to get new books for me (I read a lot of Warhammer 40k). With their coupons they email to you (just had to sign up for a free rewards account not the pay for one that gave you an additional discount), I received coupons like twice a week ranging usually from 30-40% off with the occasional 50% off one. So I'd get a new WH40K book for cheap (Amazon sells them for MSRP, not including the omnibus and a few others, and they aren't always on the 4 for 3 deal). So I found them to great for getting books, the B&N nearby is same price (MSRP) and no deals, same with the BAM near me as well.