I enjoy my BirdieBall mat. I find that the medium speed rating is good enough to allow me to practice, and it rolls very true. A 12-foot mat lets me work on 10 foot and closer putts.

It's kind of unique, but car matting, like what's found in the trunk, works nicely. I read a golf article where pro's like Webb Simpson and Ben Crane use Toyota mats for their home indoor putting greens. It rolls 10-11 on the stimpmeter and no grain. So it's pure. Might be work a try.

Enjoy!

Paul

I second the birdie ball mat I have a 10 foot one and it's awesome

I have a 10 foot long mat at hope for practicing during winter
If you cannot get any, you can also practice on the carpet

Birdie Ball is without a doubt the way to go. They're a bit fragile, but provide the best roll of any mat I've tried.