Store4PC via Amazon offers the Sabrent Battery 2-Pack with Dual Battery Charger for GoPro HERO4, model no. GP-KTH4, for $8.50, via the directions below. Plus, Prime members receive free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $5.18.) That's a buck under our mention from two weeks ago, $27 off, and the lowest total price we've seen. To get this price:

1. Click here, scroll down, and click "Like" under "Step 1"
2. click "Step 2" to get your coupon code
3. add the Sabrent Battery 2-Pack with Dual Battery Charger for GoPro HERO4 to your cart
4. apply coupon code to cut it to $8.50