During the hyperinflation in the Weimar Republic, grocers dealt with this by changing the organization of their stores. Instead of grouping like-kind items together, they grouped like-priced items, then they would just bump the prices for each aisle.
That is certainly one solution, but what happens when the government puts a limit on how much you can charge for bread?
The best solution is the one my current supermarket uses - the price tags on the shelves are a cheap LCD display, so all they have to do to update the prices are to push the new prices from a database.
And then today I read this! What a coincidence! I never would've thought you could scale up this technique up to do it to the whole country!