Where are you getting your $30 price point? Digikey single unit pricing? At a Shenzhen electronic parts market I have seen dual cores from Mediatek and Allwinn

Where are you getting your $30 price point? Digikey single unit pricing? At a Shenzhen electronic parts market I have seen dual cores from Mediatek and Allwinner for $10-15/unit in low volume and this was several years ago. If you have leverage during pricing negotiations you can get extremely low pricing for chips that is an order of magnitude cheaper than any online list price you can find. That said, I'm skeptical that a $5 phone can be manufactured profitably with a quad core chip without a lot of subsidies either from the manufacturer or the gov't.