Searching the ebay jungle
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There is a site that does some sorting for you. It can tell you what horns are attracting the most attention....ebay won't . You can sort a number of ways that ebay often doesn't. And it can show you as multiple photos you don't otherwise have to sort through...high price, low price, completed. If you just want a quick look at what is currently in the flotsam and jetsam at the moment it's a good source.
https://www.collectorsweekly.com/musical-instruments/trumpets