You could try this. But I know what you mean... my book collection gets ruthlessly pruned every time I move and even so I have about four shelves worth that I simply can't bear the thought of parting with. It's just so nice to be able to see a familiar favourite book, pick it up, and read it, anywhere. And I know someone (naming no names) with an entire spare room full of sturdy plastic boxes which are mostly full of books that he never reads any more, but carts from house to house up and down the country every time he changes jobs. Apparently he's waiting for the day he can afford a house with its own library.