Your badges may be cheap, but some are irreplaceable as well.

Have you lost a badge because the 'lock' thing came off on the back and you ended up either losing it or with a pin stuck in your manly/womanly chest. Could be a disaster!

I have been using these for years and they are the answer. They are a little sleeve with a tiny allen key lock which a) locks the pin in place firmly and b) protects your chest from the penetrating pain!

They come in packs of 12 (complete with a weeny allen key).