This forum is for collectors of emergency vehicle models to discuss any aspect of the industry. Feel free to post comments on current releases, future models, items for sale/trade, or items wanted.
Other than EBay, you might want to try the Matchbox forum MCCH Forum under the buy/sell/trade section. I needed a dozen white crown vics before, so posted a request there and quickly got them from two different people. You do have to register to be able to view or post in the buy/sell/trade section.
I have lots of extras myself, but unfortunately not 6 of each.