It seems that the drastic drop in prices of Ethereum has cause Coinbase lock the sale of Ethereum on its site. This may be due to a large quantity of individuals withdrawing their crypto out of the site. At the time of writing this, the price of Ethereum on Coinbase is $255 USD, a drop of $41 USD since yesterday.
Bitcoin's prince also saw a dip of $41 USD going down to $2472 USD.