On a ride the other day, my derailleur hanger snapped in two and sent my rear derailleur into the spokes. Luckily I was going very slow when it happened so no frame damage or wheel damage...but my derailleur, a Shimano RD-7800 needs some TLC. The derailleur cage is bent. The tension and guide pulley teeth also have some chips and sharp metal burrs caused by the chain coming off track and binding in the pulleys.

Below is the tech doc and parts list for the RD-7800. I want to replace #'s 7, 9, and 10...but can't find a source for all the parts. I would have thought I could find the parts for $20 or so...I found one site that is charging $50 for a new pulley set. I can get a new derailleur ~$100. Am I screwed into buying a new derailleur or can anyone point me to a good source for parts?

techdocs.shimano.com/.../RD/EV-RD-7800-2254A_v1_m56577569830609123.pdf