Dear Johnny,
How do we become vampires without being bitten? If you cant think of any other way, where would we find a vampire in Arizona?
-Bunch of Friends

Dear Bunch of Friends,
Well, after some research, I found there are some magical ways to become a vampire as explained here. I also found a list of other possible methods here. One of them was being a red head, so I don't know how much faith you want to put into that list.
There have been some rumors around Tempe and the Paradise Valley areas, but I'd carry the old wooden stake with you, just in case things go wrong.
Happy hunting!