One can go to Wally World and buy a bandit sign for real estate and use clothes pins to attach a board or a piece of craft paper and even tape a turkey head target on that. A bandit sign is cheap and easy to store.
Alternately, with this being a campaign season and spring being when sellers start posting signs that say "For Sale By Owner," you can probably go to a busy corner late in the evening or early in the morning and get several bandit signs for free.