Did you that you can get a bargain at Sam's Club? Sam's doesn't have sales. So to know if you are getting a true bargain look for things ending with .01 cent. For example $10.81. Those are their markdowns.
I know that Costco marks their clearance stuff with a ._7 at the end of the price tag. I have also heard that an asterisk (*) is an item that is being discontinued.
I shop at Winco and they always mark their sale prices with green tags, makes it really easy to scan the aisles for the best deals.