The Fourth of July is upon us once again, and we all know what that means. That's right, amazing deals at the home improvement stores. Whether you are in the market for a new grill or power tool, there's a promotion that is right for you. This year, the hot item seems to be lawn mowers. I am bombarded on a daily basis by emails, online ads, and TV commercials telling me that the key to a happy summer is a new lawn mower. But why buy a lawn mower when you can make your own? Here are four YouTube tutorials to help you build your own lawn mower.