Home Depot is running a Free Tool Promotion right now.
The beauty of this deal is that I needed one (or two) new batteries.
So I bought the Battery Kit ($149 - NOW $129) and received the 2-Pack of 4.0Ah Batteries ($99 - NOW $79) for "free."
The discount was prorated across the Battery Kit and Batteries so I was able to return the Battery Kit and the net cost for the 2-Pack of 4.0Ah batteries was $59.48 NOW $49.00.
Two 4.0Ah batteries for $59 - NOW $49!!
Battery Kit [homedepot.com]