There's no shortage of people here who have been trade published. (Note that the word is "trade," as in the publishing trade, not "traditional," which gets thrown around a lot by scammy pay-to-publish people.)
It would serve you well to define your terms, too. At a time when digital-only publishing is normal and common, making up the majority of all sales in some genres, are you limiting your question to print publication? Or do writers whose works were sold only in digital form count? Do you mean only books, or do you include short stories and novellas? Are you limiting your question to fiction, or do you count non-fiction, textbooks, reference works, user manuals, that kind of thing? What about poetry, scripts, magazine articles, opinion pieces?
When I was new here, I started buying books from people I knew at AW, but my budget simply did not allow that practice to continue. Like I said, there's a lot! You might even have some members' products on your shelves.
Maryn, knowing many do not use their actual names here