I know this is a small get some money job, but it's still a job. For now own, have people sign contracts BEFORE you cut the grass; that will get your money a little faster. If they hack up to a amount like your one neighbor, you have proof they never paid you for your services and you can sue at small claims. For the guy that moved, if you have someone witness you cutting his grass at $100 worth, then that could work; you would be going to court more for principle, court cost are around $35. You could probably get that too.

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