I have been doing this in a generic way. I have been using mauget micro-injection for trees, and back pack sprayer for small shrubs in the landscape. For tree up to 15 ft high the price for has been 15-30 dollars per tree over that and it time and materials. Shrub work has been hard to price. I have been chargeing 20.00 per 5 back pack. I use the rocket sprayer for small shrub. How do you pirce your tree/shrub work? I use hand held deep root feeder. Would like to know how you all are doing it.