We don't get involved with that here because there's way too many variables. We don't know what the hourly labor rate is for the shop you're going to choose, whether they go by "flat rate" or straight hourly time on the job, what the typical range of labor rates are in your area of the country, what diagnostics have been done to lead someone to think all four injectors failed at the same time, whether you want new or rebuilt injectors, etc. You didn't even bother to list your engine size. The mail order wholesale cost for injectors ranges from $29.00 - $185.00 plus shipping. You're better off getting an estimate from some local shops. They will be different so you'll have to compare them to see what additional services they plan on doing. The lowest price isn't always the best value. Be aware that without doing their own diagnosis, some shops will just do the work you request, then it's too bad if it doesn't solve the problem.