Relax. The big stores are not going to charge a surcharge. If they do, people will either pay with cash/check and therefore spend less money (bad for the store imposing surcharge) or start shopping at stores that don't charge a surcharge (also bad for the store imposing surcharge). They are going to use the ruling to try to negotiate swipe fees with the cards they accept, if anything.
Do you think that Amazon.com or any other online retailer is going to be charging a surcharge? Of course not. Amazon would have a price advantage over any local retailers imposing such surcharge...
There is no way for a merchant imposing a surcharge to win.
