I use either ADM or Mazuri. Both are $18.50 a bag delivered in bulk. Bulk for my distributor is at least 10 bags...
I've switched over to ADM from Mazuri on my rats, like stated above, the rats think the Mazuri is a treat. I've found that I go through one bag less a week on the ADM. I still use the Mazuri on mice though, didn't see a difference on them, plus the ADM pellet is twice as large, and harder for the mice to get a hold on through the mesh.

Cut the middle man, buy direct...