Ocean Aquatics carries an item called "Tigger Pods" which is a bottle of live copepods.
I am currently in the process of setting up my refugium as well, so will likely be buying a bottle of these little guys to "seed" my refugium with pods. Kind of pricey, but seems like an easy way to kickstart the pod population?
Here is a link to the item:
http://oceanaquatics.com/store/product/381/Tigger-Pods/