My Father in law collected toy trucks but he collected all the gas station and hardware store trucks. Some people collect only tin, others only die cast. And a cute collection I have seen was where the person collected trucks with logo's of things that touched his life. For example he has one with the name of his favorite bread, another with the company he used for trash collection........you get the idea. Then he started adding trucks that had a name of a state he had been to etc. It seems to me that if you only have a size in mind you may want to start looking on the internet.