Plenty of people use coupon sites to find deals on things they would like to buy. In the past couple of years, we have covered plenty of decent themes and plugins for coupon sites. Coupon Countdown for Clipper is a handy extension that adds a responsive timer to your coupon site. It displays timers on coupon page, categories, store, and other pages.
The plugin is jQuery based. It lets your visitors know when each coupon will expire. You can enable or disable the countdown timer on specific pages. You are going to need Clipper for WordPress for this plugin.