You can purchase ETHEREUM-POW-IOU from these places
Go to Kucoin.com
The People's Exchange
Go to Hotbit
Buy Bitcoin, Ethereum and more with Instant Delivery and easy verification on our trusted Australian Platform.
Go to Bitfinex
The largest and most advanced cryptocurrencies 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 Huobi
Huobi (火币网) is a Chinese digital currency trading platform and exchange based in Beijing. Huobi was founded in September 2013.
Go to Poloniex
Welcome to Poloniex. We are a US-based digital asset exchange offering maximum security and advanced trading features.
Go to Kraken
Buy, sell and margin trade Bitcoin (BTC) and Etherum (ETH) in exchange with EUR, USD, CAD, GBP, and JPY.