The cost of having your fuel injectors cleaned professionally ranges from $50.00 to $80.00 and can sometimes cost as much as $100.00 to $200.00 depending on how many fuel injectors you have and how hard it is to get to the fuel injectors.
Some fuel injectors are easy to get too and remove to clean and some fuel injectors may be harder to get too and remove because they may be hidden under other stuff that needs removed.
But it should not cost any more than $200.00 to have your fuel injectors cleaned.
If you're experiencing poor fuel mileage or the engine is misfiring and you've replaced ignition coils then it could be the fuel injectors causing the issue.
Having the fuel injectors cleaned can be worth it and sometimes it's just as cheap and better to have your fuel injectors replaced if they are really bad or clogged.