If you shoot with the Sony a6000 Mirrorless, like I do, and soon, the Sony a7r II Mirrorless, You already know how important it is to have a few extra batteries. Currently, I have 5 batteries total, for my a6000, and 2 chargers.
Now that I'm about to acquire the a7r II, I am about to buy 2 more batteries. I saw this deal on B&H's website. $29.95 bulk pricing for the Sony NP-FW50 battery (Click to order). Normal retail is $49.95. Bulk pricing is also available for the battery charger. (click to order)