Twenty states boast average gas prices below $3, spanning from New Mexico to Missouri to South Carolina. Mississippi, the state with the nation's lowest gas prices, offers drivers an average gallon for $2.71. More than 61 million people are expected to travel by car over the July 4 holiday, AAA forecasted.

Costco is one of the few national retailers that won't be open on the Fourth of July. It will close all stores on July 4. Trader Joe's stores will open on July 4 but all stores will close at 5 p.m.