One of the great things on this site is being able to search through who has what machine. Sometimes its worthwhile to message people and just ask if they are willing to sell.
The flipside is that many of us have machines that are never leaving our collection and it can get a little old telling people no. So, why not add a flagg aka checkbox that would indicate whether a person is willing to sell/trade each machine in their collection? If you wanted to take it further it could be tied into the map so that people could see who within a certain distance has a specific title they are willing to let go. It could also be used for pinsiders looking to buy locally or on a trip just to know who they might want to contact.
Any thoughts?