Gas prices nationwide could increase by 10 cents or more by this time next week.

Officials from AAA have said that Tropical Storm Issac, which is currently ripping across the Gulf of Mexico, will shut down offshore oil rigs.

The National Hurricane Center has predicted that the tropical storm will become a hurricane on Tuesday with 74 to 95 mph winds. It is expected to hit from an area southwest of New Orleans to the edge of Florida's panhandle.

Several Bolingbrook gas stations still had gas at $3.99 as of Tuesday afternoon, though several others had gas at $4.25, according to gasbuddy.com. 

Here's where you can find the cheapest gas: 

• $3.99, Marathon, 290 Veterans Pkwy. and Lily Cache Lane
• $3.99, Costco, 830 E Boughton Rd. and Woodward Avenue 
• $3.99, 7-Eleven, 398 S. Schmidt Rd. and Lily Cache Lane
• $4.09, BP, 543 S Bolingbrook Dr. and S Frontage Rd.

Nationwide, the average price for a gallon of unleaded was $3.75 on Monday, up nearly 30 cents from a month ago.

Tropical Storm Isaac targeted a broad swath of the Gulf Coast on Monday, bearing down just ahead of the seventh anniversary of Hurricane Katrina.

The potential for a landfall as a Category 1 hurricane as soon as Tuesday prompted evacuations along a wide area of the Gulf Coast and sent people out to stock up on staples.