Today Home Depot is offering UP TO 33% OFF SELECT CORDLESS ELECTRIC LAWN MOWERS as their deal of the day!  You have to buy them online to get the special pricing, but you may be able to pick it up in the store rather than having it shipped.

They have 3 to choose from, like this:

BLACK+DECKER 18 in. 36-Volt Cordless Electric Lawn Mower
Was $349.00
-$100.00 SPECIAL BUY SAVINGS
Today Only $249.00

Home Depot Deal of the Day LINK
Available online only, may be available for store pickup.