Costs more than gold. At December's peak rates, one Bitcoin costs as much as $18,000. For this much, you could also buy 300 grams of gold, at current rates.
In 2010, you could buy one Bitcoin for less than $0.10. Back then, it would take 10,000 Bitcoins to buy two pizzas.
Bitcoin exchanges. Bitcoins can be purchased through exchange operators dedicated to cryptocurrencies, as well as traditional operators such as Chicago-based CME and Switzerland-based Swissquote, among others.
In those public exchanges, Bitcoin is traded under the XBT and BTC symbols. Bitcoin Cash (BCH) is another cryptocurrency with its own price.
CME's Bitcoin Reference Rate (BCC) is a spot price index used by CME, and is based on the daily Bitcoin price on specialised exchanges such as Bitstamp, GDAX, itBit and Kraken.
Source from :- http://www.aljazeera.com/news/2017/12/bitcoin-buy-171219100738438.html