I just made this an option for my clients this year. I sent out the letters on Jan. 06 and received one yesterday for payment in full. Granted I did offer a 10% discount for the prepayment, but now I have use of the client's $$$ until the end of November. Investing this $$$ wisely, should result in a greater than 10% return over the course of (11) months. Do any of you other mowing companies offer up this option?