I purchased the mat a year ago for 100 dollars. It was lightly used and is in great shape. Here the link to the website I got it from:
http://www.manduka.com/us/shop/categories/products/mats/black-mat-pro/
It has a lifetime guarantee!
I am looking to get 50 dollars for it. I also have a black yoga blanket to put on top that I can add in for 30 bucks. It helps in hot yoga!