If you've clicked here you most likely know what this is.
It seems to be cheapest for a while for this old favourite. Spares are easily found although this tough wee chap can take quite a bashing before any significant damage is imposed.
Go on, you know you want one - or another one, perhaps.
At this price it's almost cheaper than a set of spares !
Time to stalk the cat or possibly deliver cheesy wotsits to your partner across the sitting room in a chinook like manner!