Woot offers Scotts MossEx 3-in-1 Ready-Spray, Moss Killer for Lawns, Hard Surfaces, and More, 32 fl. oz. for $13.99 (orig. $22.99). Free shipping for Prime Members.

Product Description:
Scotts® MossEx™ 3-in-1 Ready-Spray® is a fast-acting formula that effectively controls mosses, algae, lichens, and liverworts. The product gets to work within hours, and does not stain concrete or other surfaces! Apply Scotts® MossEx™ 3-in-1 Ready-Spray® on lawns, ornamental gardens, around homes and on roofs, patios, decks, sidewalks, and more (as listed). It can be used at any time during the year; however, best results are obtained with actively growing moss in the spring or fall. To apply, simply connect the sprayer to a garden hose, turn on the water, and spray, keeping it moving for an even application. Do not use on lawns when temperature exceeds 85°F. During warmer weather apply late in the day. Application during cold weather may delay appearence of moss damage. Applying this product in calm weather or when rain is not predicted for the next 24 hours will help to ensure that wind or rain does not blow or wash pesticide off the treatment area. One 32 fl. oz. bottle of Scotts® MossEx™ 3-in-1 Ready-Spray® treats up to 500 sq. ft. 

• Scotts MossEx 3-in-1 Ready-Spray is a fast and effective way to control mosses, algae, lichens, and liverworts
• This liquid treatment is non-staining and kills moss within hours
• Connect the sprayer to a garden hose and spray any time during the year
• For use on lawns, ornamental gardens, around homes and on roofs, patios, decks, sidewalks, and more (as listed)
• One 32 fl. oz. bottle of Scotts MossEx 3-in-1 Ready-Spray treats up to 500 sq. ft.