You can purchase NERVOS-NETWORK from these places
Go to Kucoin.com
The People's Exchange
Go to Bittrex
Bittrex is one of the larger crypto to crypto exchanges offering a large number of trading pairs into bitcoin - including all the major cryptos such as darkcoin, nextcoin and litecoin
Go to HitBTC
The most advanced cryptocurrency exchange to buy and sell Bitcoin, Ethereum, Litecoin, Monero, ZCash, DigitalNote, Ardor.
Go to Coinone
Coinone provides various blockchain and cryptocurrency related services, including cryptocurrency exchange center and foreign remittance.