I've been looking for a mat too. My old mat has lines every 1/8" that went across the mat in both directions. It is white and has no odder I've been trying to get another one like that but so far I can't find one. Actually, I can't find one that has 1/4" line either. I'm hoping that someone will find a mat with at least 1/4" markings across the mat. Some mats have an odor that give me headaches. Sometimes, I buy two of something that I really really love just so when it wears out, I don't have to be in the position of not being able to buy it again. The mfg. doesn't make them anymore.
If I do find one like that, I'll post it.