just for reference in mainland china you could buy grey market imported xbox one's for $460 with bundled game.
more or less the same story in HK, give or take 20$
Source: I go there often because of work, it's where the US Xbox One i currently own is from. Neither the xbox one or ps4 are going to do much higher numbers, because theyre both basically already widely available despite the ban.
One question I will ask though, is the $550 console theyre selling the one with kinect or without? because all the ones i have seen there thus far are with.