Regular price is $130. They give you a pre-sale store credit of $30 good only on this item (otherwise known as a $30 discount) bringing the cost to $100 for the brace. And they also give you $20 post-sale store credit for later.
https://www.primaryarms.com/sb-tactical-sba3-pistol-stabilizing-arm-brace-black
https://www.primaryarms.com/sb-tactical-sba3-pistol-stabilizing-arm-brace-black