Home Depot has the Ego 20" mower with 5.0 AH battery and charger for $339 on a special buy for today only.
Not the self propelled model, but I’ve been looking for one of these for a while and haven’t seen it this low.
https://www.homedepot.c
They also have a couple other Ego bundles on sale
110 MPH 530 CFM 56V Lith-Ion Cordless Blower and 15 in. String Trimmer Rapid Reload Head Batteries and Chargers Included for $259
https://www.homedepot.c
20 in. 56-Volt Lithium-ion Mower kit with 4.0Ah Battery and Charger + 15 in. Bare Tool String Trimmer Included for $399
https://www.homedepot.c