I had a solenoid go bad on one injector on mine. $270 for a reman. I changed it myself. It was number 6, which is by far the hardest one to change. It was still a piece of cake to do it. Any good reputable shop should be able to change all six in less than 4 hours, with a break for lunch.
Btw, if one solenoid goes bad, it will shut off all the injectors on that bank. Which basically puts the truck in limp mode. At first I thought all of mine pooped the bed, but after doing some digging I was able to figure it out.
I'd make sure you know exactly what you got going on before giving a big chunk of change to somebody.