By Meg Wingerter Staff Writer mwingerter@oklahoman.comOklahoma City — Saturday will be the last day to buy health insurance on the exchange, and Oklahomans who don't sign up by then will have to find another form of coverage or go without for 2019. The Centers for Medicare and Medicaid Services reported 66,480 Oklahomans had enrolled in a plan as of Dec.Read more on NewsOK.com