The iPhone 3GS may not be on sale for much longer if reports from 9to5Mac are accurate. 9to5Mac reports that the iPhone 3GS is “disappearing from stock databases with very little expected supply for the coming weeks”. This is contrary to the rumor that the iPhone 3GS would be kept on sale for another year as a pre-paid cheap iPhone priced at $350. But then again it matches up with another rumor that Apple may be launching multiple new iPhones next month with one of them being a cheap(er) pre-paid device. Of course this does hint towards a iPhone 5 launch in September as Apple keep last years model on sale, which would be the iPhone 4.