I think they are difficult to find.  I've been 
thinking of selling some of mine actually, I do 
have one for sale right now- check out my page if 
you're interested.  I would like to see the ones 
at Pocket, I had their address before the site 
moved, but I had never seen anything there worth 
the hassle of going through a bank transfer.  If 
someone wants to e-mail me the url, fine, if not, 
fine too.  ^_^