The CV shaft is the best way to go but you may be able to repair what you have. Starting at the engine as Sam said the bushing insert can be replaced. I'm out of them now but maybe someone has a few extra they could sell you. They cost about $4 to $5 from these people
http://www.triangleoshkosh.com/eng/p.../ball-bushings but they have a minimum order, you need part #HE1410P.
DSC03398.jpg
Next are #9 the rag joints, you need 4 new ones from Cub. The last ones I got were a little under $15 each.
I have never had to replace #10 and I don't think they wear but check yours.
If you have a drill press you can make your own shaft, they are easy to do. I ordered a piece of 5/8 shaft from McMaster Carr and did mine in a pos drill press that isn't worth $20.
The rear coupling is the expensive part like Sam listed. You could make your own if you know someone that can weld. Here is the hub part that would be needed.
http://www.surpluscenter.com/Power-T...027-1-1495.axd
Good luck and let us know how it goes.