I ended up getting five buttons from Ohio Power for $20.
But they are not the old diode disks. These are new technology, and use a "switching circuit" to give the bulb a soft start. They claim to reduce light output only about 10%, so I guess they do something besides soft start.
They were intended for the lanterns at the entrance to our subdivision so the association wouldn't be rebulbing every two months. One bulb burned out within 4 days of installation...unrelated "infant component mortality" undoubtedly, however the non "techno geek" association assumes the disks will soon cause the other three bulbs to fail also. At which time I plan on convincing them to purchase LED bulbs. If one of those burns out prematurely, we will be forced to move our house.