Limo service people often have great connections and don't forget
checking out Craigs List for "college bartenders" under "party services"
lots of those and often easier on the wallet. I'm guessing they've seen
everything.
If you don't see any listed
you can always post an ad with "WANTED" in the headline. Ads are free, btw.
http://tucson.craigslist.org/ http://phoenix.craigslist.org/
Hope this helps.
Slutty Wife ;-*