Amazon has the Traxion Versa 12" x 24" Roll-up Mini Utility Mat (Black) for $15 with free shipping for Prime members or on $35+. Rolls up for compact storage. Cushions knees when working on cars or other projects.
Amazon has the 3-Gallons Valvoline High Performance SAE 80W-90 Gear Oil (Three 1-gallon jugs) for $42 with free shipping. Has excellent Amazon Reviews.