Case in point...
A couple weeks back, a big name store had a deal on Arm and Hammer laundry detergent. They were $1.88. And, there was a $2 off 2 coupon in the paper. Their ad, conveniently (and perhaps shadily) pointed this deal out prominently, the potential price of $0.88 nice and big to catch everyone's eye. While I am sure they would say they were doing us a "favor", the truth is that I am confident they caught more than one shopper who didn't note the coupon needed part and didn't check their receipts after.
When I went in to get the deal, they were of course out of stock. And so I asked for a rain check for the max I could get, ten bottles. The gal wrote the price check...for the $0.88 price!! I didn't notice until I was home, but at that point I decided it was their error, to my benefit. I returned to the store this week with my rain check and coupons...and oh, what a deal!!
Laundry Detergent = $2.99 on sale, BUT...
$0.88 each, per rain check
Minus two $2 of 2 coupons
Total cost = 0.48 each, or $4.80 total paid