JC Coupon Lite plugin provides easy to use coupon management to be included in your posts and pages or even in side bars. There are heaps of options t
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Is this plugin free?
Yes. but there is a pro version available too with loads of other options. Check it here http://jaspreetchahal.org/wordpress-coupon-plugin-jc-coupon-revealer-pro/
View the screenshots tab here on wordpress