mazuri should be available (special order) at any purina dealer as they are owned by the same company.
most people believe mice need higher protein and fat content than rats.for mice i use dyeless dog food thats 21% protein and 8% fat.it's called country squire and sold at menards HC's.
also check the dealer locator at kentfeeds.com,they make a 19% and 23% rodent food (lab blocks).have fun!