This 6-Pack of Dinobros Pull-Back Dinosaur Cars drops from $29.99 to $12.99 to $10.39 when you click the on-site coupon at GreenKidz via Amazon. A similar six-pack would normally cost you at least $16. This pack is one of Amazon's best-selling toys. They have an average rating of 4.7 out of 5 stars from over 8,000 reviewers. Prime members get free shipping. Non-members get free shipping at $25, otherwise it adds $5.99. Sales tax is charged in most states.