The vortex matting is nearly identical to the Gold Stopper Matting that Martin Prospecting sells. Todd Martin is a strong supporter of GPAA and LDMA and has a great mining shop in Inman, SC, not far off of I20.
Google Martin Prospecting or MJ Coins in Inman, SC.
Tammy (Crisson Gold Mine) in Dahlonega, GA also sells the vortex matting and all types of gold hog mats as well.
Both Crisson and Martin Prospecting are the go to suppliers for me.