I've gone back and forth on this idea ever since you posted it yesterday.
My first thought was, "not me."
Here's why:
Too expensive at $10-ish minimum just to leave some flyers
Too few eyeballs - who picks up flyers at a yard sales?
Too time consuming - including double trips delivering pizzas
Too fleeting - who keeps flyers they pickup at yard sales?
But last night and this morning as I continued to ponder it while also reading the opposing views, I thought, "well maybe . . "
I imagine (can only imagine . . .) the biggest benefit may not be in buyers picking up flyers, but rather the face to face, memorable interaction with the sellers.
They'd likely remember that computer dude that stopped by and bought them pizza and drinks. And it would certainly turn into a story they'd relate to friends/family that later inevitably ask "How'd the yard sale go?"
Plus yard sales are often multi-family events. So in reality, you might make a direct connection with handful of people at every stop.
If nothing else, perhaps when any of those folks DO have a computer problem or hear about a friend with a problem, they'd either remember me or my business name would jump out at them from a Google search.
So I've kind of drifted from "no way" to maybe I will. For an investment of 100-150 bucks I'd get a lot of localized face time and buzz. And who knows - maybe someone WOULD pickup a flyer as well.
Plus I might find a bargain at a sale.