Ok, so it's not the sexiest affiliate niche on the planet, but there are plenty of reasons to get excited about this category.
Just about every home owner needs a lawn mower, this is a huge market. Moreover, lawnmowers generally command a pretty high price tag. Ever heard of a Roomba?
There's now a list of robotic lawnmower equivalents, and they're not cheap.
Lawn Mower Affiliate Programs