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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 0.04
TRX 0.32
JST 0.075
BTC 63426.05
ETH 1663.52
USDT 1.00
SBD 0.43