Amazon has the Slime 2-in-1 Tire and Tube Sealant Puncture Repair Sealant (16 oz) for $5.55 with free shipping on $35+ or with Prime (extra 5% off for 5+ subscribe and save orders). Same price at Walmart. Seeks out and instantly seals tread area punctures up to a 1/4” in tires and up to 1/8” in tubes.