Big Lots 20% off coupon
Being a member means you'll get an email from them about every two weeks, which is pretty reasonable. And you can always unsubscribe later.
Caveats: one coupon per person. Excludes previous transactions, previously initiated price holds, rentals, alcohol, gift cards, and calling cards. Cannot be used with any other coupon, rewards discount, or associate discount. Coupon must be surrendered at time of purchase. Value is forfeited if item is returned. Only original coupons accepted.