I feed my girls The Honest Kitchen. It is a freeze-dried raw food - meaning it looks like a powder and you hydrate it with warm water as you feed. They have sample bags and travel-sized bags available and will usually send you a sample bag if you ask them. The breakdown of nutrients is very similar to the premium kibbles out there. The food is really easy to use as well.
Here is a link to their site.....
http://www.thehonestkitchen.com/index.shtml