With stock and price varying by ZIP code, Home Depot offers the EGO Power+ 20" 56-volt Lithium-Ion 3-in-1 Cordless Lawn Mower, model no. LM2001, for $399 with free shipping. (Enter your ZIP code to see if this price is available in your area.) That's the lowest total in-stock price we could find by $403. Features include a 20" cut capacity, five deck height positions, LED headlights, up to 45-minutes of cut time, 30-minute charge time, foldable design for storage, and mulching, bagging, and side discharge modes.
Update: Apply coupon code "RWBEVENTHD" to cut it further to $394.