Hi Meli, I'm just starting out on the FMQ also.....only practiced a little so far. I just got my extension table yesterday, already had the darning foot and trying to decide if I need the teflon mat.
Here is the name of one of the mats: Supreme Slider LaPeirre Studio Supreme Slider Free Motion Machine Quilting Mat. I just got an email from Amazon the other day with this mentioned. Leah Day also has one on her website. If you decide to get one, let me know how it works for you. Have fun with the FMQ