Generic 70/30

Does anyone know how much generic 70/30 insulin costs at Walmart down there in the real world? I know R and NPH are only $25 per vial but not sure about 70/30

You can mix them yourself...http://www.webmd.com/diabetes/steps-for-preparing-a-mixed-dose-of-insulin#

Thanks John I guess I had read that a long time ago but still am curious about buying premixed just to have a emergency stash for a major emergency (WWIII type situations)