There are 5 portable sawmills listed in Arizona. 3 of them offer mobile or on-site milling — the sawyer brings the mill to your logs rather than you hauling them.
Services available in Arizona: Custom Milling (3), Mobile / On-Site (2).
Not sure how much lumber your log will yield? Use the board-foot calculator to estimate board feet and milling cost before you call, or read the custom milling cost guide for typical rates.
