Correct me if I'm wrong, but don't they have different taxes in different states if the US? This may have something to do with the price variations. Also the "free" delivery (which is built into the price) may vary depending how far you live from the distribution point.

Having said that, here in Oz, national supermarket chains often have dearer price in the more affluent areas that in working class areas.

And the same brand of petrol can vary up to $0.25 per litre (about $1.00 per gallon) depending on where you fill up.


Cheers,
Keith