www.jerrysartarama.com for awesome creative mark cutting mats, they r 3x as thick as the ones u get from joanns.
they usually have a good sale too. and a word about harborfreight blades..dont waste your money, the are crap.
good luck
katz

I have the Martelli mat and yes, they are expensive but well worth the $$. I have had mine for well over 7 yrs and no cuts. My blades don't seem to dull. It has been shipped to 2 different states and has been rolled up and returned to it's flat self. It's been in the sun and no damage. It's reversible and easy to clean.