Where can I purchase ETH?

In order to transact FLP outside of Gameflip, you need to pay for GAS fees, which are transaction fees charged by the Ethereum (ETH) network (see What is Ethereum Gas). Therefore, you need ETH in your ERC-20 wallet to transact FLP outside of Gameflip, including when you send FLP from your ERC-20 wallet to your Gameflip FLP wallet.

HitBTC, Bittrex, Coinbase, Kraken, and Poloniex are few examples of exchanges where you can acquire ETH.