If you have a lot of demand, you should be able to go to parts listers and say &quot;Hey! I&#x27;ve got money for you! Come get money by listing.&quot; Ok...not quite that simple, but that&#x27;s a great carrot to use.<p>If that&#x27;s not enough to get them to list, you might need to find another strategy. Is there something else that the suppliers really need, and don&#x27;t have, that you could give them which would also give you access to up to date parts information?<p>You can also fake the marketplace, to some extent. If someone comes looking for a part you don&#x27;t have, make sure you still take the request, and then go fill it manually. If you do this enough, you should be able to earn the trust of the suppliers, and get them to be more active participants.