Some main stream stores, Barnes and Noble at least , were selling booster packs. In case you don't have a local friendly game store. The demand out stripped supply so prices were super high. Just in the past month supply has exceeded demand so prices have started crashing.
As of the writing of this post, Miniature Market has boosters and boxes for both of the first two sets in stock. My FLGS also has tons of booster boxes re-stocked. Seems like a shipment just hit?