Given that this is hacker news, the answers here are unsurprisingly biased towards building toys. Blocks/Duplo are great, but who is going to explore the newly

Given that this is hacker news, the answers here are unsurprisingly biased towards building toys. Blocks/Duplo are great, but who is going to explore the newly built environment? Enter the die-cast toy cars/trucks/construction equipment/farm equipment. I've had good luck with the Ertl 1/50th scale stuff, which can be purchased in lots on Ebay.