Why not see if you can strike it lucky in the two Polls currently underway here on CoffeeSnobs. You may be able to get at least a bag from of one them.
Failing that, you can mail order green beans from Arabicas in small quantities, eg 1-2 Kg; The Coffee Company also sell green beans; likewise for Alan Frew at The CoffeeCo.com although a bit expensive compared to others and not to forget Green Beans Australia. There are probably several others but these are the only ones that I have done business with.
All the best,