1) Basis for comparison 2) Bob Barker prop 3) Cost 4) Item checked by shoppers 5) Item of interest to a shopper 6) Label showing cost 7) Merchandise label 8) Number that may be shocking 9) Place for a markdown 10) Prop for bob barker 11) Retailing terminology 12) Sale item 13) Shock source, sometimes 
[n] - a tag showing the price of the article it is attached to
noun a tag showing the price of the article it is attached to
a label or tag that shows the price of the item to which it is attached.