I found Lowes (hardware) to be one of the worst about this. I lived in an area with 4 Lowes, and never shopped at my local one because of how much more expensive everything was, and never clearance. I'm not talking a couple dollars, in some cases 4x the price of one just 15 minutes away.

In the days before places started requiring ID for returns an acquaintance of mine would pick up rifle scopes at one Walmart and return them at another Walmart on a route he took. Only once every few weeks to give employees time to rotate out. He could pay for a few days of gas with that arbitrage.