Another vote on keeping it.
That money isn't likely to have come out of his pocket, but rather his business. It's worth it to him because he'll potentially save thousands. In the face of that, $42 is pocket change.
Landscaping is a very lucrative business if you do well. It sounds like their business is getting good contracts which means that he doesn't need the money and in all probability considers it a business expense to pay you. You may feel slightly awkward with the money but it'll be an even more awkward situation if you try to give it back. Just keep it and consider it a fair payment for services rendered.
I moonlight as an IT consultant and technician and charge anywhere from $65 to $200 per hour, with a one hour minimum. What he paid you was much less than he'd pay a qualified accountant.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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