I've been coming in here lately because they stock at least two items Costco does not, pineapple juice and regular snapple iced tea (wtf Costco? diet snapple only?).
On one of my trips I spotted energy Vitamin Water which is really great for the gym and they have a deal for 1.10 each if you buy 10, the regular price is 1.49. They only had eight but the cashier was nice enough to give me the deal anyways. However, I don't know if this was deliberate or not, but she gave me the discount for seven of the bottles, which would actually be the correct economic reasoning in this case, as my utility for eight bottles is not as diminished as in the case of ten bottles. Secret economist cashiers? You never know...