Most affordable option
Bend Yoga Studio
After reading about how gross foam mats really are, I decided to invest in a cork mat. I did an extensive search and found that most mats are over $100 AND often you must pay for international shipping ($13-$15). This was not only affordable, but according to my colleagues the rubber is thicker than others they've seen. The grip on this mat is the best I have ever had, I am recommending this to all my fellow yogis and yoginis. I practice almost everyday, so I am interested to see how the mat holds up again heavy use.
The only reason this is not a five-star rating is because it took almost a month to ship. The site says orders could take up to 28 days to ship, however I was given a ship date and that date was pushed back three times.