Please find below some useful links for crypto-currency exchanges you want to consider signing up with. These are exchanges where you can buy and sell a very wide range of crypto-currencies.

These are exchanges that I know, are currently functional. However, I give no personal guarantee for any of these exchanges listed below. I advise you to do your own research about them before committing to any of them.

Luno Exchange (Nigerians should sign up with this one to buy BitCoin)  https://www.luno.com/invite/4XDEP

Bittrex https://bittrex.com/

Binance https://www.binance.com/?ref=11115105

Coin Exchange https://www.coinexchange.io/markets

Cryptopia https://www.cryptopia.co.nz/

Kucoin https://www.kucoin.com/#/?r=1ds27

CoinHouse https://coinhouse.eu/