Home Depot has the RYOBI ONE+ 18V Lithium-Ion 4.0 Ah 2-Battery and Charger Kit (PSK006) for $99 with free shipping. Includes your choice of free tool (15 options) with purchase; scroll down to "Free Gift with Purchase" to select free tool choice and add to cart.

As an example, you can get the Starter Kit and the RYOBI 18-Volt ONE+ Cordless Orbital Jig Saw (P5231) for $99 with free shipping (add battery kit then add the jig saw to see the discount).