I bought a bag from my LHBS. They can order anything I want - I just have to wait a week. You might start there. Rice hulls are dirt cheap. You probably won't save much by buying in bulk. I bought 3# for about $3. So to buy 10#, may cost me $10 or $9. Where you save the $$ is buying grain or extract in bullk. Keep the bag sealed - maybe vacuum pack - and you won't have to worry about shelf life.
Every pirate lives for something different. For some, it's the open sea. For others (the masochists), it's the food. For you, it's definitely the fighting. Two things complete your pirate persona: style and swagger. Maybe a little too much swagger sometimes -- but who really cares? Arr!