I also check the price on the exchanger I use the most, YoBit.
But as it is known the price is always higher than the actual one, so I check it on Coinmarketcap from time to time as well.
I use Coinmarketcap when I am by the computer, and when I go somewhere I use the applications which are installed on my Android. The news about crypto prices there is always updated, and I get them every hour.
That's the most popular site in the crypto world, I am also checking on this site but if I only like to see the price of bitcoin, I refer to
http://preev.com/I use
http://preev.com/ as our basis every time I buy paypal, so I think lots of people relies that site on bitcoin active price.