Ez grass is by selling logs, iron, vote keys and obsidian. Everytime I log on, my oak logs shop is always out of stock and thats primarily due to people needing oak logs since they are the most common logs to be used.
How to obtain grass Step one - steal... In all seriousness though, this is an amazing guide on how to earn grass.
So true, bahah Thanks for the comments. Thinking of doing a big update for this soon which will include other methods and just an all round update to values, etc.