Use SDBs on sign posts to sell items - for people who don't want towers
Not everyone wants a huge tower taking up space on their street or wants to sink major resources in it. But it would be fun to sell just a couple of things, to see who would come around to buy them.
Even with a tower, this would be a pretty cool thing! I could put a Seed Kicker and a Guano something-or-other dispenser right next to my garden. Hot! +1
Hmm . . .
A few might be nice for some people, but making a wall of them would just be crossing the line. That's what towers are for. I get some people don't want to spend the energy and resources to make it, but that's the price of a tower. Maybe fore people who want to sell an item, but not a lot of things, that would be fine. But personally I think that you have to spend some work to be able to sell things this way