Couponing at Dollar Tree can be tricky due to size restrictions. Often, coupons don’t match up because the packages Dollar Tree carries are too small. But every once in a while, there is a lucky exception, like this one on Halls Cough Drops! The 16-count bags qualify for the coupon, making each bag only $0.50. There may also be bonus bags with even more cough drops for the same price at your store.