Found mine while CRHing or you could go to ebay: http://www.ebay.com/itm/Counter-Sta...87?pt=Coins_US_Individual&hash=item35e02017af PS - That search took me all of 20 seconds...
Those are cool but I would not spend much on them. I probably wouldn't spend more than 10 cents for one. That alone is 10x face value.