I ordered 15 bags of native earth off of pet 360 with free shipping and a 10% discount code, so it was less than 17$ a bag. Thats a lot cheaper than the 35$ a bag I was paying for Mazuri 6f. After buying NE, I'm starting to see my rats loosing a bit of size and eating less. I'm not sure if they don't like it as much or are not getting as much nutrition as the Mazuri was providing them, but I might be switching back. Only issue is I have 6 months worth of NE in my basement.