Confession: I get a little thrill helping people track down a paperback, especially when the title is as deceptively common as 'Deception'.
If you're after a mass-market or trade paperback of 'Deception', start with the big national
chains — places like Barnes & Noble in the U.S., Waterstones in the UK, and Chapters/
Indigo in Canada usually stock the most recent paperback runs or can order them quickly. Their websites often show in-store availability, and it's usually accurate. I also check online retailers such as Amazon and Bookshop.org; Amazon tends to have a huge selection including used copies, while Bookshop.org routes purchases to indie shops, which I prefer supporting.
For harder-to-find paperbacks, I go to used-book marketplaces: AbeBooks, Alibris, and Powell's often have multiple editions and international printings. If it's out of print, those secondhand options and local used stores are my lifeline. Personally, I like the hunt — finding a dog-eared paperback on a shelf feels like striking gold.