I just use a regular mat I bought at Ikea many, many years ago.
I have usually had the Protection Racket non-slip ones at work, but I'm not really to fond of those. Non-slip is mostly a pain because moving things around a little bit without having to take everything off is a very welcome quality in most cases apart from on on a riser. Even then, I've never seen the need except for the rubber being useful for very dirty floors. If you're on the same level as everyone else, not having to move a bit after everything is set up is the exception rather than the rule. It's pretty much expected that someone needs the drums move a little bit.