buono compares new and used prices for 30 books by Ruth Symons across European bookshops. The cheapest new one is Cosmos at €7.49; the cheapest second-hand copy is Cosmos at €3.19.
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.