What is the cost of Fuel Injector cleaning?

Clean and Flow Test Top Feed Injector ($30 per injector)
Clean and Flow Test Side Feed Injector ($30 per injector)
Clean and Flow Test GDI Injector ($30 per injector)
Mercury Optimax Air Injector ($35 per injector)
Hose End Injector ($35 per injector)
Piezo Injector – Cleaning & Seal install – No flow test ($25 per injector)
Rush Same Day Service ($50.00 per set)
Flow Test Only ($15.00 per injector)