I get mine from Sundayint:
http://www.sundayint.com/index.asp?P...TS&Category=57
I have both the regular and thin. I use the regular for most things but use the thin for small stamps and sentiments I've cut up--like all the sayings in So Many Sayings.
I love the customer service because they personally call to make sure I got my order and everything is ok, plus they give discounts to SU Demos.