You don't need to buy the die to make a pop up tree.
Here are my directions for the 6-part trees I put in my Christmas card last year:
http://extremecards.blogspot.com/200...-tutorial.html
There is a cutting file (svg) available here for the 10-part trees, which resemble the Sizzix one:
http://forums.surecutsalot.com/viewt...22&hilit=craig
You can also hand cut them. I probably hand cut this tree 5 or 6 times when I was working on the pattern. I wouldn't want to hand cut 100, but a couple is no big deal.
You can also buy a rubber stamp version from Some Assembly Required.
http://www.some-assembly-required.com/
Carol