You can purchase REVAIN from these places
Go to Kucoin.com
The People's Exchange
Go to HitBTC
The most advanced cryptocurrency exchange to buy and sell Bitcoin, Ethereum, Litecoin, Monero, ZCash, DigitalNote, Ardor.
Go to YoBit
Buy and sell Bitcoin (BTC) on YoBit Exchange!
Go to Mercatox
Go to OkEx