You are getting this to replace car trips for groceries, gear, and daily hauling, so you want one that lasts years instead of falling apart next season. Look for sturdy frames, hydraulic brakes, and a motor that handles hills with a heavy load.
Summer is winding down, which means bike shops and online makers start dropping prices to clear out floor space for newer shipments. Last year's model is often the exact same machine with a different paint job, and buying it on clearance saves you hundreds.
That intro window is a deadline, not free money, and any balance left when those 18 months are up will get hit with regular interest.