Here's your chance to buy a piece of Star Trek: TOS history.  An original working tribble is up for auction on ebay.  If you can't afford the $5,000.00 buy it now price, there is always another tribble from DS9 for sale.

This rare, large, walking Tribble is one of only 6 ever made and was used on the 1967 original Star Trek episode, "The Trouble with Tribbles" . Not only is this Tribble in great condition after 42 years, it actually works /walks.  One of these Tribbles is on display at the Science Fiction Museum in Seattle and is owned by  Paul Allen.

This Tribble will come with a Certificate of  Authenticity, signed by a member of the Doohan family. (source Ebay)

View ST:TOS tribble auction here.

View ST:DS9 tribble auction here.