Where buy toslink/optical plugs NOT cables?

Here is a weird question for all you audiophiles!! Most components that have a toslink optical connection have a plug in the hole when not in use to protect from dust and dirt. Anyone know where I can buy some? No I didnt lose the original, but on shipping it broke, thank goodness I was able to remove it from the unit.

Radio Shack used to carry them. Not sure now that they've turned to cell phones and satellite tv sales as their primary business. Worth a try.