To date, using exchanges has entailed a high level of risk, although security is getting better. Moving transactions offchain is one way of minimizing fees.

Binex: website here.
Aims to launch in late 2018, and will share 70% of trade commission with traders.

Bithumb
World's largest exchange by volume, as of 2017. Offers a $5 signup bonus.

Bittrex

Based in California. Supports a huge range of coins such as Einsteinium, Potcoin and HempCoin. You need to verify your account to make use of this site.

Bluebelt
Gate.io: 10% of trading fees for the first year: click here.

Poloniex

You can also use Poloniex to make loans.

Uphold

Bitcoin exchanges: 21,000 monthly searches according to Google Adwords; CPC: 265 Yen.

BTer
E-Toro

My referral link!