EGO Power+ 20-Inch 56-Volt Lithium-ion Cordless Lawn Mower for $358.99 shipped. Here is a screenshot for reference. It provides 45 minutes of cut time with its Advanced Arc-Lithium 4.0 Ah 56V Battery and Rapid Charger. Most places have it for about $449.
This deal has expired as the price has been raised. Congratulations to those able to get in on it.