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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 0.15
TRX 0.23
JST 0.032
BTC 84798.76
ETH 2345.32
USDT 1.00
SBD 0.66