I know Penny has used stencil material from Plaid. I have ordered different ones from Amazon (they have thin to thick). I will see if I can find the exact one later...... gone for the day. I know Lisa has ordered from Amazon as well.
Depending on the thickness you want, and how many times you want to use them, I have even cut them out if transparency film (the boxes of 100) - I use those for foiling too - but they are thin and wouldnt hold up repeatedly with a detailed design, but are great for simple things.
Will try to look for the link before I leave for the day - if not will check tonight.
EDITED TO ADD LINKS:
Great deal:
http://www.amazon.com/Grafix-Clear-Plas ... H72EFAV7SQHave tried these too - thicker :
http://www.amazon.com/gp/product/B00085 ... UTF8&psc=1Have used both the 3M laser transparencies and the HP laser transparencies too - also through Amazon.