We do alot of mulch, and whenever re-mulching beds I offer to install edging (that black stuff with the rounded top) for $3/ft. That includes labor and material. If somebody really wanted it they'd pay. Usually they'd only need like 40 feet or so.. big deal an extra $120 ya know? Note: I don't have any trenching or bed edging equipment. We just trench out the area with shovels and install the edging by hand. That's why I charge so much! Well one of my mowing clients called and wanted an estimate to take out all of her broken, torn up edging (same black stuff), and replace it. I headed over there with the measuring wheel. She needs 350ft of edging installed! I held my guns and left her an estimate of $1050. What do you guys think?