I am planning on using an auger on one of my excavators to punch out the holes.
If I am supplying the trees, I am planning on doing some sort of a warranty on them, but I think that the company that we are bidding for will end up supplying all the trees and plantings.
I am planning on punching out the holes with the auger, throw in some fert, place the tree, backfill with some topsoil (Since the area we might work in is all fill clay) mulch, stake and water. Any extra watering will be done by us for a fee.
Alls I need is a number to start with. It doesn't take us all that long to plant a tree, so that $150 number seems super high. but then again, I did ask for numbers.