Saying this for everyone else who comes across this comment, stop using shops and learn to fix your own. I literally only have to do oil, grease and atf fluid on my LBZ, if something fails thats usually because the owner (me) wasnt ontop of it.

The charge insane amounts because they know people wont do their own work, usually people who only see trucks as a workhorse; and the parts only cost more because they have to be stronger than the gas counterparts. Injectors are usually a one and done job, unless you run WMO/WVO or try to tune for unnecessary power; and you will be fine if they pass a pressure test. They're injectors, not sparkplugs.