There are many exchanges that sell and buy NIM. Compare the options and find the one that suits you best.
KuCoin is a popular exchange amongst traders, with live support and mobile apps.
HitBTC is one of the oldest exchanges.
Changelly is a non-custodial facilitator between exchanges and traders
Bitladon is focused on the European market and accepts credit card payment.
Changehero is a beginner friendly exchange without login.
BTC-Alpha is an exchange for traders with over 100 coin
LAToken was one of the first exchanges to list NIM.
Stealthex focuses on anonymity and instant exchange.
CoinSwitch allows Crypto-Crypto exchange with easy to use interface
CoinDCX is an advocate for cryptocurrencies in India, its origin.
Easy to use exchange that supports credit cards