Gas, if you drive you need it. Of course the prices fluctuate daily and depending on what side of town you are on the prices can vary, sometimes significantly. So to help find the lowest price in town, check out this MSN gas price tool.
Simply type in your zip code and you will see a listing of prices from stations in your area. Not all stations are listed, but typically stations in the same area only vary slightly so this will give you a good idea of what the prices are where.

Jason Faulkner is the man who brings you our daily tips. He is based in Atlanta, Georgia.
Nothing against MSN’s site, but I like Gasbuddy.com and have used it for years. gasbuddytogo.com works ok when I’m mobile, too. The site is volunteer supported with some things like points for inputting prices and things I think.
Thanks for the link Tim.
I actually found tons of sites which do this, but I’ve used MSN’s stuff for a while which is why I posted their site.