buono compares new and used prices for 30 books by Zerocalcare across European bookshops. The cheapest new one is Un polpo alla gola at €8.42; the cheapest second-hand copy is Kobané calling at €7.89.
Cheap books UK · Libri usati economici (Italia) · Livres pas chers (France) · Gebrauchte Bücher günstig (Deutschland) · Cheap books Europe
Some links here are affiliate links: if you buy, buono may earn a commission. It never changes the price you pay.