Collins bookshops have "Snow White and the Seven Dwarfs : the art and creation of Walt Disney's classic animated film" by J B Kaufman for $14.99 in their latest sale, down from $45. 256 pages.
Very nice book - may spend my next rainy afternoon reading
Lots and lots of colour illustrations, including many development sketches.
Their online shop seems to be charging full price so you will need to visit in store.