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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 0.13
TRX 0.24
JST 0.030
BTC 83252.79
ETH 1566.75
USDT 1.00
SBD 0.76