By Alexa Back Retailers like Costco, Walmart, Target and Dollar General fortify when facing grocery inflation. When regular shoppers walk into a grocery store, higher prices are just the norm lately. It becomes second nature. And while frequent shoppers know they’re paying more, some new research shows exactly how much. Record grocery inflation has been reported by Numerator, including a high of +15.1% in June, almost double what it was at the beginning of the year. Beverages are seeing the impact of this inflation the most. Other products like frozen meat (+28%), milk & milk substitutes (+17%…