Smallaxe, Good point in relaying a uneducated customer to the facts of horticulture. JB, I have done jobs like this in the past also. As today, I don't do much pine mulches anymore. We cannot obtain pine bark nugget mulch........it is all shredded barks. Anyway, for removal would cost the same as would installing the bed to begin with for me. I would only remove a 1/3 of the existing mulch if allowed by surface roots,etc. You will have to wheel barrel the stuff around back and reapply. To me this is double indemnity. Make sure that the 1/3 you remove and relocate is enough to complete the back beds also. I cannot give cost analysis on your pricing to install new. It depends on your overhead and labor.