Easy-Bake Oven
Since its introduction in 1963, the Easy-Bake Oven has become a staple of American culture. How often did a toy come along that produced something edible? In 2017, it was reported that an original Easy-Bake Oven still in its box can net $300.
Talkboy
This prop for 1992's Home Alone 2: Lost in New York rose to fame after John Hughes and 20th Century Fox requested it be designed for the film; the company then sold a retail version of the cassette player and recorder. If you went out and bought one after seeing it in the hands of Macaulay Culkin, these days, it's worth about $200.