VirMach BF

(function() {
    // Check every x seconds
    var CHECK_FREQUENCY = 60;

    var regex   = /<div class="pricetable">(.*)<\/div>/g,
        beep    = document.createElement("audio"),
        current = getText(document.getElementsByClassName("pricetable")[0].innerHTML);

    // Initialize beep
    beep.id       = "beep";
    beep.autoplay = false;
    beep.src      = "https://www.soundjay.com/button/beep-07.mp3";
    document.body.appendChild(beep);

    function scrape() {
        console.log("Scraping...");
        var xhr = new XMLHttpRequest();
        xhr.onreadystatechange = function() {
            if (this.readyState == 4 && this.status == 200) {
                var next = getText(this.responseText.match(regex)); // Next deal?
                if (next != current) {
                    current = next;
                    notify();
                } else {
                    setTimeout(scrape, CHECK_FREQUENCY * 1000);
                }
            }
        };
        xhr.open("GET", "/black-friday-cyber-monday/?" + Date.now(), true);
        xhr.send();
    }

    // Strip HTML tags
    function getText(html) {
        var div = document.createElement("div");
        div.innerHTML = html;
        return div.textContent || div.innerText || "";
    }

    // Notify you
    function notify() {
        var i = 0;

        setTimeout(function() {
            alert("NEW DEAL!\n\n" + current + "\n\n" + "Press OK to reload");
            location.reload();
        }, 800);

        setInterval(function() {
            i++;
            if (i > 3) return;
            beep.pause();
            beep.currentTime = 0;
            beep.play();
        }, 200);
    }

    scrape();
})();