What size pad do you want? I took a look at what the cost would be for one 4ftX12ftX5in
.74 yards concrete per pad
13.32 yards
Cost = 1531.8
Add fiber mesh instead of rebar = +65. If you add rebar + 200
Formwork:
4X8 plywood = 9, 8 ft strips out of each one = 72 ft of form work.
Total footage needed for 18 tees = 864ft. 864/72 = 12 sheets of plywood at 13.50/sheet
Cost = $162
Construction Steaks (this is hammered in the ground every 4 ft or so? and the formwork is screwed into this):
I forget how many feet apart is required between the steaks but let's say you need 12/pad (4 corners, 1 extra in middles of short sides and 3 extra/side on long sides = 216 steaks (.32 each = 69.12).
Cost = 69.12
So that would be
Concrete = 1531.80
Plywood = 162
2X2 Construction steaks = 69.12
Total = 1762.92 + tax + either rebar or fiber mesh. Fiber mesh = $65 more for this order, otherwise add $200 for rebar, actually would be wire mesh, not real rebar.)
Hope that gives you an idea.