There's so many options, it's hard to say what's "best" - I've been through a few, so I do have a few tips.
1) Cheap is not better. Yes, you can get cheaper mats, but they start to shed/break down faster.
2) I prefer thicker mats; I have arthritis, so if the mat I get is too thin, it hurts my knees or wrists in some poses.
3) No slip is key... you want a mat that's not going to slip and slide all over the place.
4) Two thin mats work just as well as one thick one!
5) Never use the mats at the gym. LOL. (Ringworm is GROSS.)
If you have a Marshall's, try there. I got some good ones there. Also check reviews on places like Amazon.com before buying, you'll get some good feedback that way.
Writer, mother, wife, and breadwinner. I love to run, but running doesn't love me, so I'm switching to my low-impact bike.
I'm not pregnant, just fat: My blog. fatnotpregnant.blogspot.com/
| current weight: 190.6