I get excited just thinking about signed books, so here's the long version: if you're chasing a signed copy of 'Cold Moon', start with the obvious but often most fruitful route—the author's own channels. Authors will frequently sell signed copies directly from their website store or through a newsletter exclusive. I once snagged a signed novella that way because I was on the mailing list and caught a weekend drop. If the author runs a small press or partners with a specialty publisher, those editions are sometimes signed and numbered, and they sell out quickly, so subscribing to the newsletter is worth it.
If that route turns up empty, widen the net: check reputable secondhand marketplaces like AbeBooks, Biblio, and Alibris, plus eBay for auctions. For collectors’ peace of mind, look for listings with clear provenance—photos of the signature, a bookplate, or seller notes about where it was obtained. Local indie bookstores sometimes host signings or can connect you with signed stock, and conventions or book fairs are classic places to find signed copies or to ask the author to sign your copy in person. If travel isn't an option, some authors accept mail-in requests or will provide a signed bookplate they can send to you to affix.
A couple of extra practical tips: verify the edition (firsts and limited runs matter if you value collectability), compare prices across platforms, and be ready to pay a premium for personalization. If you tell me the author’s name, I can point to more exact sellers or ongoing signings for 'Cold Moon'.