Greasy Fork

Check for purchase_banner_inner before redirecting to /purchase

        }else if(/0\.00/gim.test($(".button_message").eq(0).find(".dollars[itemprop]").text())||/Name your own price/gim.test($(".button_message").eq(0).find(".buy_message").text())){
            if (!document.getElementsByClassName("purchase_banner_inner").length) window.open(url+"/purchase","_self")
        }

Thanks, it has been added to version 1.0.9