Betsy prides herself on her shopping skills and often uses GroupOn to save money on products she would purchase anyway. She recently used a GroupOn offer to save $$2\mathrm{.}00$ on a $48-$ounce container of Tide detergent. This is an example of a $\_\_\_\_\_\_,$ a form of sales promotion.

dealer incentive

sweepstakes

coupon

rebate