I recently learned about some of the great deals they have at Dollar General stores (thanks Erika!). Such as, Electrasol tabs every day price of $2.50 each. With the $2.50 coupon that came out last month (4/16, I think), it would be free.
I did a little investigation online at afullcup.com's Dollar General forum. Some people had posted about having problems at the stores when they presented their coupons. So, I contacted Dollar General Headquarters to get their official coupon policy. Here is their reply, in its entirety.
If you have a problem have a problem with a cashier, you can show them this.
All the best,
Col