Got a Herbie's mat on a group buy thru AK. Yeah, pretty expensive for a piece of foam -- if all you're getting is any old block of foam. Way I figure it, I have way too many projects going to seek out different foam sources, figure out a nice way to cut it circular so it doesn't look trashy, and try a bunch of different kinds out. But maybe there is a cheap DIY foam approach out there, I dunno. Or use cork as others suggest. I do know the new mat dropped the noise floor and clean up the sound. You might want to search on herbie's and see if you can find the group buy thread which may have some additional comments/results. But heck, with a 90 day trial, why not?!