You might find success going to an actual lumberyard or hardware store and asking if you could do a demo/vendor show during their lunch hours (10-2 pm).
Positives:
-you're the only vendor there, so all of the focus is just on you and your product/service.
- if you land one sale, you could have a ripple effect and get more later on. Sometimes, contractors have a "monkey see, monkey do" mentality. If one uses your product and likes it, there's a good chance it will carry on.
Negatives:
-you'll most likely be expected to provide lunch or split the cost of lunch between you and the lumber yard.
-you'll need A LOT of free crap to pass out to everyone.
- plan on at least 60-75% of the people who attend the event to only be there for the free stuff and food.