So I heard about the silly LA area folks having a rebate programs but that is how they roll.
Maricopa County, AZ Residents only
Take your gas lawnmower to participating Home Depot stores and get $150 off a battery powered or electric corded lawnmower.
More info - http://cleanairmakemore.com/lawn/
The Mowing Down Pollution Program provides Maricopa County residents the opportunity to purchase a new electric or battery powered lawn mower when they turn in their old gasoline lawn mower. Participants will receive a $150.00 voucher towards the cost of a new electric or battery powered lawn mower at participating Home Depot stores when their gas powered lawn mower is recycled.