I charge separatly for Prep work .. I charge say $30 to prep, any edging and weeding , they I charge for the labor to install the actual mulch, ( pick it up deliver it, take out of truck, and put in flower bed ) then the cost of the mulch on top of that .. So say for one yard : $30. mulch, $30. prep work, & $30. install.. = $90.00, The more mulch at a time will lower the per yard cost.