Flat Free 18X8.50-8 Quick-Seal Tube - $25 (Moody)
Quick-Seal tubes come pre-filled with Flat Free Tire Sealant. The sealant's synthetic fibers, adhesion agents, and corrosion inhibitors work inside the tube to find and seal punctures as large as 1/8" as soon as they occur. The Quick-Seal tubes provide standard inner tube maintenance along with continuous protection against future flats. I have two of these and am asking $25 each.