Using a marketing automation platform, you can capture contact data from whoever wants to be a supplier, and are then able to send emails only to those people who have specified that they traffic in a specific type of item. This allows you to find exactly what you're looking for while also growing your general supplier network.
With a form on your website, you can gather relevant information from potential suppliers, such as contact information and what kind of items they primarily traffic in. By allowing them to come to you when they want to, you don't have to waste valuable time chasing down leads.
Your contact relationship manager will automatically update with the information that interested suppliers have offered. This is especially useful not only in trying to find suppliers, but also experts who could verify the authenticity of and appraise various types of items.
If you are looking for something specific, you can create a decision to send an email to contacts who have entered a certain type of item in the form. For those that didn't enter the item, their information is simply updated in the CRM.