Since I am not sure where you live, I will just say that these sites post private individuals selling boards. You would just have to figure out how to get it to you.
www.distressedmullet.com
http://www.eatonsurf.com/UsedPaddleboardsRedux.htm
Crazy wicked prices sometimes here, but if you are in Canada you have to deal with customs duties, freight, insurance etc.
A lot of people won't ship boards to buyers as the risk of damage during shipping and the insurance policies are not the easiest to use.
If you are in Ontario or Quebec, shoot me an email via our website and we can figure out if we have any used boards that might fit you.
Happy shopping!