Amazon has the Earth Science 2.5 lbs. 500 sq. ft. Fast Acting Lime Soil Fertilizer Enhancer with Nutri-Bond Run-Off Reduction Technology (12131) for $6.99 with free shipping on $35+ or with Prime. (extra 5% off with 5+ items S&S order). Starts working immediately to raise the pH of your soil, helping grass and other plants absorb nutrients more efficiently, and get your lawn back to looking its best.