5K+ bought in past month. Amazon has the 2-Gallon Ortho GroundClear Concentrate Year Long Vegetation Killer2 on sale for $34 with free shipping on $25+ or with Prime (extra 5% off for 5+ S&S orders). Rainproof in 1 hour, kills weeds, grasses and existing vegetation, and prevents regrowth for up to 1 year.