Draft/house root beer in Phoenix metro?
Joe's Real BBQ in Gilbert serves a housemade root beer, which I believe is also served at Joe's Farm Gril (same owners, but down the road a piece). I'm not sure if it's offered at Liberty Market (same owners as, and kitty-corner from, the BBQ place), but I wouldn't be surprised if it were.
Joe's Real Barbecue
301 N Gilbert Rd, Gilbert, AZ 85234
Joe's Farm Grill
3000 E Ray Rd Ste 101, Gilbert, AZ 85296
230 N Gilbert Rd, Gilbert, AZ
At the time of this writing...
Delux has Sonoran.
Dick's Hideaway has Thomas Kemper.
(Note the link to locations selling their products - no guarantee the Root Beer is on tap, though
3146 E Camelback Rd, Phoenix, AZ 85016
6008 N 16th St, Phoenix, AZ 85016
I found another interesting local root beer, Cider Mill's Rootin' Tootin' Root Beer. Oddly, in exactly the same bottle that Sonoran Root Beer uses, I thought it was the same company at first.
Postscript: it turns out the guy who runs Cider Mill used to own Sonoran Brewing company. He sold the beer business to concentrate on soda. That probably explains the bottle.
In town in November, I ought a J J Lazlo's root beer for the road at the information booth at the Saturday morning's farmers market at the Downtown Phoenix Public Market.
J J Lazlo's is a vanilla, creamy style rather than aggressive, spicy root beer. Interesting and distinctive flavor from the local honey. Here's the instructions on the back label:
Trying the url http://www.jjlazlos.com/ just now, it seems to be dead. Wonder if this product is still around.
Edited to add: reading the mention of Cider Mill above and Sonoran connection, I think that's our guy.
Downtown Phoenix Public Market
721 N Central Ave, Phoenix, AZ 85004