Ariz. Rev. Stat. § 44-6702
A. It is a violation of this chapter for a supplier to do any of the following:
2. Refuse to deliver, within a reasonable time after receipt of an order, equipment covered by the dealer agreement specifically represented by the supplier to be available for immediate delivery if this equipment is available in reasonable quantities unless this failure is due to any of the following:
5. Discriminate in the prices charged for equipment of like grade and quality sold by the supplier to similarly situated dealers in this state. This paragraph does not: