If your single-stage snow blower isn't clearing all the snow from your driveway and sidewalks, you don't need to buy a new snow blower.
You just need to tweak or replace your scraper blade.
The scraper bar, which is made of hardened rubber or plastic, is located underneath the snow blower and between the wheels.
It acts as a backboard, scraping the snow off the ground and into the snow blower auger.
Eventually, the constant contact with the ground will wear it down, resulting in a thin film of snow behind the snow blower.
You can adjust the scraper blade by loosening the bolts and slightly pulling it down.
Eventually, you'll need to purchase a replacement. But, it's a whole lot cheaper than buying a new snowblower.