In order to acquire just that one model car, I sometimes have to buy a (part of) a collection. I offer for sale cars that do not fit in my collection or are duplicates on 911scales.nl. Or sometimes a model car from my own collection.
As a collector I know what you expect from a model car. You will never come across a brand new model car with me. All cars come from collectors and have been in a collection before. Very regularly there are beautiful and special model cars that are like new despite their age.