Collecting of die cast toy cars like Hot Wheels and Matchbox grew out of a passion for cars and childhood memories. Until the early 1990's, collectors were constrained to just a few options: collecting variations and errors, collecting every car in a series or year, and collecting special exiguous editions not sold in stores. It wasn't until 1995 that die cast toy car makers started producing cars for sale in market that were packaged specifically for collecting. It was the introduction of the Treasure Hunt Series from Hot Wheels that started it all.