Alfie chuckled to himself, even if he was the only person who'd gotten the joke, and nodded. "It sounds good. Then if likes it I'll be able to get him the rest of them..." Without having to worry about what sort of books he liked. In Alfie's mind, series' were a bonus.
"Thanks, mate." Then, because he though it was rude to use him to find a book and then brush him off to pay for it, he thought for something to say. "Seen my sisters lately?"