Secrets of the Sire mostly covers Kickstarter, New York Comic Con and Trading Cards. Based on 2 issues we scanned in the last 6 months, these 2 newsletters cover the most similar ground. The closest match is Mantel, which also writes about New York Comic Con and Trading Cards.
Ranked by topic overlap: newsletters score higher when they share distinctive topics, not just broad ones everyone covers.
Newsletters for Collectors - Above the Mantel & Mantel's Mail Day
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