I took a chance on some LGHE4s from an Amazon vendor after reading the reviews from vapers who seemed to know their batteries. Always be sure you're placing the right vendor into the cart!

http://www.amazon.com/gp/product/B00S25MDVO

I got mine from "doingoutdoor" but I see Lightning Vapes is on there. No Prime, but free shipping and you know they'll be authentic and shipped quickly.