Are you sure you need an entire shaft or just the u-joint at the rear of the shaft? Unless something hit the shaft there is really not much that can go wrong with it (possibly your mech mis-balanced it?). The u-joint is what usually goes out on a shaft. Usually if they are bad you will have some slop in the shaft...you will be able to move it side to side or up and down a bit. I have a u-joint in my garage that I ordered from Merlin a while back so he should be able to get them. I would try that first. You would want a new one anyways if you replace the shaft anyways so might as well try that first.