That's a terrible analogy!
Of course the price of one game can be different from another!
A much better analogy is: Game prices(shh) at Walmart.(I work near one(A), my mom lives next to another(B), and my wife works near a third(C).)
I can go to A, mention that Final Fantasy IV is $29, $5 less online(Walmart.com), if I could get that price now, I'd buy it. They match Walmart.com.
I can go to B, mention that Final Fantasy IV is $29 online, and they remind me it's the same price there!
I can go to C, mention that Final Fantasy IV is $29, or $10 less online, and they say "Sorry, we don't match walmart.com at this store." I say "Walmart doesn't match Walmart's prices, but they will match somebody elses?" he says, "Umm, yeah." I say, "Well I'll buy it here, start playing it, order it online for less, and return it here for the higher price, right? Package, UPC, and other stuff you guys check match, so should be no problem," he says "But the serial number has to match," I point out, "No serial number on the package, it doesn't matter," he says, "I guess so."
So I did, only sad part was the online one had different artwork, and it shoplifter-beeped on the way into the store.