XCSource via Amazon offers the XCSource GoPro Accessory 6-in-1 Bundle Set Kit bundled with the XCSource GoPro Accessory 10-in-1 Bundle Set for $22.98. Coupon code "F7WWUGTS" cuts the price to $12.99. Plus, Prime members qualify for free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, shipping costs $6.35.) That's $83 off list and the lowest total price we could find. These sets include head straps, chest straps, hand grip mounts, straps, suction cups, and screws.