Rather than buying R1 Superbits in stores, I think you are better off ordering them on line. You will have to pay local taxes when you buy in stores. Go on
www.dvdpricesearch.com and you can research for different e-tailers.
R1 Superbits are more expensive than R3 counterparts because the former are never on sale. If you have a region-free player, you can order R3 Superbits from Asian websites and save a lot of money.