I use the Carburator Factory in Sac., cost is about $32/injector and is same day service if you drop them off in the morning(about a 4hr turn around). A bit far to drive from Tracy, I would think there would be a shop a little closer, you might give a call to some of the repair/machine shops in your area and see if there is anyone locally.
If you want to try a DIY method you can flush them yourself using a push button/pule on/off toggle switch(on when pushed, off when released), a 3cc syringe(needs to fit on teh injector intake/outlet ports), a spray can of intak/carb cleaners, an injector harness(or two tiny femal blade connectors), and a 12vlt power source. Search youtube, there are a few videos that will show you how to set it up. I cleaned the ones on the '84 I am restoring myself, when I pulled them one was dry while the pother three were wet. When I back flushed it a bunch of crap came out and then it flowed as nice as the other did three after cleaning.