Multiple Size Proofs

I have proofs of two different sizes-- 4x6 and 5x5. Does anyone know where I might be able to buy one proof book that can hold both?

Thanks!

The different sizes are because of different size cameras (35mm and medium format)

I'm not aware of a single book that would hold both sizes, although you might be able to get different size pages to fit in one book. Ask your photographer or just get two different size albums (since each one only holds like 300 proofs max)