Here are some pictures worth many words, all data taken from https://www.bitfinex.com/order-book/?pair=BTCUSD

For those of you who might think that there aren't many BTC left on the exchanges to purchase, there seems to be plenty on Bitfinex.





Next, we have an unusual gap on the order books, cannot seem to get a clearer view directly from the exchange.







Finally, a large purchase order lower than before but this time broken up into 2 parcels. Previously in July there was an order at $12,5 for 804 BTC.