I've been trying to come up with a good advertisement to put on my spring fliers going out with invoices on monday. I just got an idea to offer a free yard of mulch when buying 4 or more. I sell mulch for 40$/yd and charge them hourly for installing and I get the mulch for around $25/yd. So if they bought 4 just the mark-up alone would cover the $25 and people love it when they think they're getting something free. Plus this might attract more high end customers who need in the 6-10 yard range and its just going to require labor. Think this is a good idea? And if you don't state your logic and be polite about it.