You walk out to a pristine lawn every morning while the mower hums quietly in its garage, leaving you zero grass clippings to bag or haul. Setting up the boundary wire takes an afternoon of crawling around the yard on your hands and knees, but once it is pegged down, you are done pushing a mower for the rest of the season.
Late summer clearance events are the absolute cheapest time to buy, as stores clear floor space for fall gear and holiday stock. Make sure to shop around and compare prices across a few different retailers before you pull the trigger so you know you are getting the actual markdown.
That intro window is a hard deadline, not free money, so make sure the balance is fully paid off before the promo period ends or you will get hit with all the deferred interest.