Supplier: Landau House
Website: Etsy Store.
Products: I am a sucker for a miniature book, so I've had my eye on Landau House for a while. They do a huge range of vintage looking 1/12 scale books in really reasonably priced sets - typically 8 books for £7. I bought two lots, a set of Nancy Drew mysteries and a set of P.G. Wodehouse's Jeeves books. They're true to scale, have nice clear covers and turnable blank pages with an aged appearance, and even come with a tiny little bookmark. If you spend over £10 you get sent a free set too!
With my 1/12 scale Frankie Stein - Picco Neemo body with Monster High pen head.
Post and Packing: £1.20 for one set within the UK, with small increments for each added set. I paid £1.50 for two sets, and they were with me in a bubble wrap envelope a couple of days later.