It's just strange that not all exchanges are at the same price yet. They are off quite a bit. One says $890 another says $880 and yobit had it at $986 but since yesterday I could not even get to that site anymore. 
$10-20 difference between exchanges is normal in bitcoin. Most bitcoin exchanges are manipulated by whales who own 99% of the coins. It's one of the major reasons why bitcoin will never rise beyond $1000 level. Those of you dreaming $1million bitcoin rudely realized what a pipe dream it was. Greed leads to self-destruction. Go and work hard at your jobs, make money the right way. Bitcoin is for scammers, drug dealers, child pron pervs and other low lifers.