One place I found lists a bunch of injectors, with many different grades and price options. You can look them up for yourselves. they are a bit vague on whether the prices quoted are per set or per injector:
http://www.dpppower.com/injectors.html
I couldn't find anybody in KC that would work on my diesel that seemed remotely capable of working on them. After I got my "screw you" estimate, I shopped around even more for someone to beat the price I was quoted...No luck there. So the big dealer got to stick it to me, despite my extensive attempts to get away. And no, they WILL NOT install rebuilt injectors.
What parts did they stick me with besides an injector? I don't remember, and I haven't been able to find the invoice. But it was a lot of money, and I couldn't find any other repair shop that would take on the engine problem, even after I got the estimate.
Even after your dealer puts in the individual injector that is a problem, then your dealer will stick you with all the other oil pump issues that they can invent. As I recall, these injectors are powered by a high pressure motor oil pump and...you will always need one if your injectors are declared in need of repair. Then there is all the wiring harness that your dealer will declare desperately in need of replacement in order to make it work, and by the time it is all done, you will be more than adequately screwed.