From their announcement:
Hi folks, I've made the 15mm scale corridor system cutting file freely available from the Ponoko website on a Creative Commons license.
The file is in their system and it's all ready to send to cut, just set your preferred cutting location and material and it's ready to go. Cutting/material/ shipping/ tax comes to about 100 US dollars.
I've optimized the file as much as possible but it's quite a lot of cutting lines and it attempts to make use of all of the real estate. Sorry I couldn't make it any cheaper but the file is there if you have your own way to do it.