https://tools.woot.com/offers/milwa...4-0-ah-battery-2pk-3?ref=w_ngh_mc_itm_is_1_tl 2-Pack Milwaukee M12 12-Volt REDLITHIUM XC Extended Capacity 4.0 Ah Batteries (48-11-2442) for $88.99 - 10% when you apply coupon code SPOOKY10 on the final checkout screen = $80.10. Shipping is free for Amazon Prime Members (must log in with your Amazon account and select a shipping address for Woot to apply free shipping) or is otherwise $6 per order.