Worked pretty well. The magnet costs not much more than a postcard but has a long life. Typically, it goes on the fridge, which is in the kitchen, the busiest room in the house. Cool . . . We found that coffee cups worked the best.
Travel mugs are next best.
Our secret is popcorn . The smell goes everywhere. 90 percent couldn't care less who you are. Have two people manage the booth. We have on record five people in three years that knew the name of the company that gave them the popcorn.