Dale Earnhardt Sr was one of the greatest drivers to ever drive NASCAR. His on track death was a immense loss for the racing community. He had one of the biggest followings of any driver ever and is still the biggest seller and most valuable piece of memorabilia you can own as far as NASCAR. Check out a couple of the very unique cars for sale at MassAuthentics in the collage above. These are both very rare and have become valuable collectors items because of the design and rarity of his items hitting the market.