Amazon offers Prime members the Hot Wheels Pop Culture Collection Marvel Die-Cast Vehicle 6-Pack, model no. CMV61, for $10.84 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.43.) That's the lowest total price we could find by $19, excluding other Amazon vendors. It includes vehicles modeled after Captain America, Wolverine, Spider-Man, Groot, Star Lord, and Ant-Man.

Orders placed today (December 22) using Prime are guaranteed to arrive by Christmas. (Cut-off times vary by location.)