I need €20, I have gold, easiest way?

Hello everyone! I want to buy an item on RMAH for €30, but I only have €10. I have added €20 to my b-net balance but it will take a day or two so I am wondering what the easiest way to convery some of my gold to real money would be? I'm looking to buy something on GAH that sells pretty easily on RMAH. I want at least €2.5 per million I spend. Any advices?