As one of its daily deals, That Daily Deal offers the Boss Head-Lite Hat for $6.99 with free shipping. That's tied with our expired mention from three days ago, $16 off list, and the lowest total price we could find. It features a press-on light, adjustable Velcro closure, and replaceable battery (included). Deal ends today.
Of note, you can buy two for $11.98 with free shipping.