Hint: you'll need a Prime membership.

Prime members can save $0.50 per gallon during the Fourth of July weekend, alongside low prices on barbecue grocery essentials and a new monthly grocery credit for Prime Access…

From the Gas Pump to the Grill: Prime Introduces Summer Savings Just in Time for the Fourth of July

Hint: you'll need a Prime membership.

Gas prices fell in most states last week, bringing the national average down nearly 7 cents to $3.78 per gallon, the lowest since March, according to GasBuddy