As one of its daily deals, Amazon offers the GreenWorks Pro 80-volt 21" Cordless Lawn Mower for $178.49 with free shipping. It's the lowest price we could find by $60 and the best deal we've seen. It features Smart Cut technology (which adjusts the power based on the thickness of your grass), height adjustment from 1-1/4" to 3-3/8", up to 60 minutes of run-time per charge, and rear bagging and mulching capabilities. Deal ends today.

Note: A battery and charger are not included.