Woot offers Ryobi P2807BTL ONE+ 18V Cordless Electrostatic 1 Gal. Sprayer (Tool Only) for $26.99 (orig. $219.00) + free shipping with Prime.

Product Description:

18V ONE+ Cordless 1 Gal. Electrostatic Sprayer allows you to spray water-soluble disinfectants, cleaning solutions, and lawn and garden chemicals with the convenience and freedom of battery power. Electrostatic Sprayers utilize electrostatic charging technology to positively charge particles to allow solutions to cover surfaces quicker and more evenly, reducing chemical use and increasing efficiency. The charged particles enable solutions to more effectively wrapping around a wide range of surfaces. Spray up to 30 tanks per charge with any 18V ONE+ battery.
The backpack design allows for comfortable, 1-handed operation and the holster is designed for right-handed or left-handed use. Engage the on/off switch to activate the electrostatic technology or deactivate it when using chemicals best suited for conventional spraying. The 3-in-1 Adjustable Nozzle Selector allows you to choose from multiple spray patterns, simply turn the nozzle to select between Low, Medium, and High. The low setting sprays 65 microns up to 2 ft. away, the medium setting sprays 85 microns up to 5 ft. away and the high setting sprays 160 microns up to 10 ft. away. The 1-Gal. tank is designed with a handle for easy transport when filling and detaches from the unit for removing excess liquid. The 18V ONE+ Cordless 1 Gal. Electrostatic Sprayer is compatible with Over 260 ONE+ tools.

• Electrostatic spray technology for maximum coverage and precise application