buono compares new and used prices for 21 books by Karen Homer across European bookshops. The cheapest new one is Little Book of London Style at £11.69; the cheapest second-hand copy is Little book of Dior : l'histoire d'une maison de mode mythique at €14.18.
Some links here are affiliate links: if you buy, buono may earn a commission. It never changes the price you pay.