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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 0.25
TRX 0.21
JST 0.037
BTC 98575.94
ETH 3476.18
USDT 1.00
SBD 3.42