If you already own the machine, an attachment is almost always cheaper and far more capable than buying a second walk behind blower. The catch is compatibility, which is exactly why most retailers avoid this category.
Tractor and 3 point hitch
Rear and front mount blowers for compact tractors, with PTO speed and hitch category explained.
ATV, UTV and side by side
Front mount blowers for quads and side by sides, for long rural laneways and acreages.
Skid steer and loader
High flow and standard flow blowers that move volumes no consumer machine will touch.
Riding mowers and lawn tractors
Two stage blowers that bolt to the mower you already store over winter.