Behind the counter and at the door
A menu board lists six items with their prices in a column that reads from the line; specials list three dishes; "order here" and "pick up here" arrows keep the counter moving; "please wait to be seated" goes on the host stand. Styrene's smooth face wipes clean, and it fits a menu frame or a sign holder.
Prices change
Print the menu with the prices you have today, and keep the file: changing a price is a new proof and a new sign, from one sign. For specials that change daily, a sign that says "today's specials" over a chalkboard area of your own works too.