From Amazon
SteelSeries QcK Heavy Cloth Gaming Mouse Pad - Extra Thick Non-Slip Base - Micro-Woven Surface - Optimized For Gaming Sensors - Size L (450 x 400 x 6mm) - Black
ShopBetter24
Non-slip Mat SteelSeries 63008 Black
Shopaide
Non-slip Mat SteelSeries 63008 Black