Some kind of new category in the shop where players can post their suggestions of an item they want to buy, it would work like the following:
Player123:
Comment: ‘‘I am looking for a halloween decoration for my project’’
Price: Negotiable (Players could negotiate depending on the quality of the item)
This way, builders could know exactly what items the community wants, and also players who lack building skills or free time to create could more easily get what they are looking for.