If I go to a game store filled with over priced games the first thing I do is check over everything (sometimes they slip up, or I find that rare game that I'm willing to pay a crazy price for. Rare, but it does happen)
If I'm not going to buy anything, due to prices and I strike up a chat with the store owner about their items and their business. I'll often, politely, try to explain to them why their items are over priced and why I'm not going to buy anything (because I can find the majority of these common items for much less else where). Sometimes it can be educational for both parties.
I never 'want to spit hot coffee out my nose' over over priced games. I mean its disappointing when you find something you want for 15 or 30 dollars more then what you're willing to pay for it. But its hardly something to get angry over.