Add Offerup.com as a source
Or code your site to offer other newer or slightly less popular car listing site results if you still can't find the car you're looking for with the core listing sites. I know I've experienced that with AutoTempest and debated whether or not it was really worthwhile for me to keep using AT.
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Anonymous commented
People do use OfferUp, even for rare models. Therefore, at least a button or a note would be nice. Especially international buyers who are not aware of the US marketplaces get a hint that there is yet another place to search for. Although, yes, OfferUp is blocking IP addresses from foreign countries: ‘Sorry, we weren’t able to determine your location. OfferUp is only available in the US.’ Anyway, at least a note that there is another place would help already.