You can buy cheap yoga mats at just about any place these days, even your local pharmacy or Target, but if you want lasting quality, minimal VOC (off-gassing), good grip, durability, and if weight (or color or texture or material) is a concern, it helps to have a really good guide. Especially when prices go from the sublime ($12) to the ridiculous ($150 for custom paint jobs).
From their email, based on my comments about the Manduka yoga mat I reviewed back in 2015 http://byomyoga.blogspot.com/2012/07/yoga-consumerism-where-i-tell-you-about.html). Enjoy.
"I work for a small research team (Reviews.com), and we recently conducted an unbiased review of yoga mats, and Manduka came out as one of our top picks too! Anyways, I figured because you mentioned that specific yoga mat, you might be interested in seeing our full guide. We put in over 50 hours of research, surveyed over 100 yoga professionals, and consulted with "Boston's 2014 Best Yoga Instructor" to bring you the best!"