First I found they had bacon on sale for $1 a pound. That's a pretty good price, usually it's around $2 a pound or so.
Then I discovered they had a 50% off sale on Hy-Vee brand vitamins and supplements. I've got at least 3 months worth of vitamins on hand and another month or two worth of fish oil capsules, but I decided to stock up anyway.
While they were ringing up my purchases, I noticed the fish oil capsules rang up at full price, not the sale price. I pointed this out to the clerk and he called a manager. He checked around and found that it should have been on sale too. Apparently the store has a scan accuracy guarantee, because the manager gave me the $25 bottle of fish oil caps for free!