Lucky007 via eBay offers the UltraFire S-15 Cree XM-L T6 2,000-Lumen LED Flashlight 2-Pack for $11.99 with free shipping. That's a buck under our mention from February and the lowest total price we've seen. (It's a current low for this quantity by $5. For further comparison, we saw a single flashlight for $8 two weeks ago.) Each flashlight features a convex lens, three modes of operation, waterproof design, and a charger adapter. They each require one 18650 3.7-volt battery (not included).
Note: Expect this item to take two to four weeks to arrive.