The very nice people at Wildwasser don't sell big sheets of minicell. They do have scraps for sale if anyone needs those. They thought that their minicell is M-200, but weren't sure. I tried NRS, and they didn't want to tell me what their minicell is. I called Qycell Corp, and they said that their equivalent to M-200 is TB-20. They confirmed that this foam is used for kayak pillars. I can now order from Amcon in Longmont. Thanks, Chief, for heading me in the right direction.