I realy wish a reset button for the shops to put all prizes (or selectet prizes) to 0. It's much more easy to prize your shop if you can start with all prizes are on 0- especialy if you don't have an autoprizer.
Yes, thats a good idea (although its prices, not prizes :)) If all of your items are all priced, then its good to reprice them (especially because my prices are either auto-priced or end in 0s).