Lt Greg;
My friend has informed me that the firm buys in bulk from an electronics supplier but no name of the supplier.
However he did tell me that you should be able to find these in an electronics store Radio Shack carrys/carried them. The actual name for these is GLASS FIBRE PEN. They are used in cleaning battery contacts and connections for electronics. So you should be able to locate either refills for your pen or a new pen entirely.
I have seen these used to clean photoetched parts for soldering and painting. So I will be on the lookout for one as well. If I can find a definite name and supplier I will reply with it here.
Cheers;
Gregory