Amazon offers the Chapin 4-Gallon Wide Mouth Backpack Sprayer for $117.21. Clip the $2.88 coupon to cut the price to $114.33. With free shipping, that's tied with our mention from a week ago and the lowest price we could find now by $31, outside of the price below. It features a 20-volt lithium battery and sprays from 35 to 40-PSI.

Note: Walmart charges $117.21 with free shipping.