You probably already know this, but in Oklahoma, cities can only get operating money from sales tax. They can use sales tax for other things as well, but the operating funds are required to come from sales tax. It's almost the reverse of the Oregon situation.

Part of the reason OKC's less-than-perfect bond rating is the city's reliance on sales tax, which experts say is les reliable than property or income tax. (Even though sales tax doesn't pay off bonds.)