chestersmum - Take a look at CSJ dog food. *not sure if I can link to them*
They have three types, Original, Command & Performance and Champ.
Low prices and I think they're better then what your currently feeding your lil man/lady on
Also if your not sure what food to choose, you can ring the owner up herself and you just need to give a description of your dog and what you currently feed him/her and she'll recommend one of their foods, and most likely give your some free samples as they only sell 15kg bags.