Exmo should be listing BTCZ in April per the Community Meeting on 3/11/2018 [24 minute mark of the video].   It is ranked in the top 75 of all BTC dollar volume, so this is big news.
https://exmo.com

The current exchanges are:    
Trade Satoshi, Stocks Exchange, BTC-Alpha, C-CEX, BarterDEX, Exrates and Graviex.

You can see some of the exchanges listed here:
https://coinmarketcap.com/currencies/bitcoinz/#markets
https://btcz.rocks/

One exchange not on CMC yet (but shown on btcz.rocks) is Graviex.
https://graviex.net/markets/btczbtc