Hi~ Here in Plano there is strict ordinance. Check on your city's website for their restrictions/ordinances.
Keep in mind the sign 'po-po' do not work weekends. Expect signs to be confiscated. I've never been fined.
Placed strategically, they can solicit several calls/leads.
Lowe's sells single bandit sign kits for less than $6/each.
Fri. evening into Sat. AM is a good time to put a couple of signs out at busy intersections and near high volume stores. Don't oversaturate. It's a trial and error methodology.
It's worth a shot. See how many inquiries you get vs. the cost (loss) of each sign. It's simply the cost of doing business ala' bandit signs. Also, place identical ads on craigslist.org simultaneously for free (for back up).
~Good luck!