Unlocked models of the iPhone 5 could reach Apple's US online store as soon as 9PM Pacific Time, according to retail sources for 9to5Mac. It's expected that 16, 32, and 64GB models will sell for $649, $749, and $849, respectively. While unlocked iPhones are already on sale in countries like Canada and the UK, the US market normally lags behind as a concession to carriers.