Did you try your zipcode in the Nutrena retailer page I linked? Also have you looked around for any feed stores in your area?
You didn't mention your area but a quick Google search shows Tractor Supply Companies littered all around the Phoenix area, there is also a few Shopper Supply in the Phoenix area...
Go to Google Maps and do a search for
livestock feed your city Arizona
they listed some of the pet store here.. but i went there and they only have 5lb bag
the store i saw on the street -- looks like they are keeping their feed on the outside..
not in this desert heat.. so i'll pass on it.
guess i'll just order from the buyer club instead.. the feeds will be delivered from another state after they are packed. and ready for pick up a few days after or so.
this way i don't have to worry about feeds being left outside in 100-ish degree heat