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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 0.29
JST 0.044
BTC 69042.94
ETH 2071.35
USDT 1.00
SBD 0.46