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coinmarketcap.com is one of the most popular.
There is also coincap.io and cryptocompare.com which has more 'reports' on them.

Coin Marketplace

STEEM 0.06
TRX 0.30
JST 0.059
BTC 70220.46
ETH 2169.31
USDT 1.00
SBD 0.53