I try to go to the manufacturer’s website when possible. If that’s not possible, I try to go to a site that doesn’t have any other sellers on it. The whole “marketplace” that many websites are becoming is awful because you can no longer find a store you trust and buy from it knowing you’re more likely to get something of quality.
Anyway, I’m sure that doesn’t help you get revenue for your site, but since you asked, I wanted to respond.