I personally purchased three bright nail polishes for a part of a girly gift bag for Anna's fifth birthday (she loves painting her nails, but mommy's colors aren't always so exciting). Each nail polish was a dollar, but after the coupon and tax, I only paid $1.06 total for all 3! That's about 36 cents a bottle.
You could use this coupon to get a great deal on a grocery item, a cheap addition to an Operation Christmas Child shoe box, a stocking stuffer for your kids, or many other options since the Dollar General carries a variety of items. Let me know if you get the chance to use the coupon before Friday!