If you don't find what you're looking for trying Insweb, use another online service such as esurance.  Esurance not only supplies a comparison of Oklahoma automobile insurance rates, but it also supplies a wealth of information about buying car insurance.  If you still aren't happy, the next step is to pick up the phone and call popular insurance companies.  Most states such as Oklahoma have representatives from the prominent insurance providers, like State Farm and Allstate.  You can also try national carriers like Geico.