Frosty, I had little luck finding dies for that model punch. I picked one up last year, had one die in it, looked everywhere but none of the other dies available seemed like they would fit. Someone told me at the conference I sold it at that dies were still available, but didn't know where or who to call.
But, someone else had to have it, so they got it for a song.
The one set in it, 5/16 inch if I remember right, still worked like new though.
But, keep a watch on eBay, the tools and dies for them show up every now and again. Then you could have two tools set up at any given time.
hey, just found this, better hurry!! Goes off in 6 hours! Don't know if those are the right dies or not, as it's a Whitney/Jensen.
Whitney Jensen Model 7 1/2 Medium Duty Portable Punch - eBay (item 140262250292 end time Sep-06-08 17:25:00 PDT)