Home Depot offers the Ridgid 18-volt 3-Gallon Cordless Wet/Dry Vacuum, model no. WD0319, for $79.97 with free shipping. That's $20 off and the lowest total price we could find. It works with all Ridgid 18-volt batteries, and includes a nozzle, locking hose that expands from 2 to 7 feet, and built-in accessory storage for the hose and nozzle.
Note: This is for the bare tool only; you will need to buy a Ridgid 18-volt battery separately if you do not already own one.