Walmart again offers the Stanley SL18301-4B 4-Gallon Stainless Steel Wet/Dry Vacuum, model no. 8210413, for $19.97. Choose in-store pickup to avoid the $5.99 shipping fee. That's tied with our mention from a month ago as the lowest price we've seen. (It's the best deal now by $14.) It features a 3HP motor, reusable dry filter, foam filter, rear blower port, 4-foot 1.25"-diameter hose, three extension wands, floor nozzle, accessory storage casters, and top handle.