Rocketbook Wave Erasable Smart Notebook for only $23.99! The Rocketbook Wave provides the freedom of a traditional pen and paper notebook, while instantly blasting your notes into the cloud using your smartphone. And when you use Pilot FriXion pens with the Wave notebook, you can erase your notes using your microwave oven and reuse your notebook. Go ahead and re-read that last sentence.  Available in two sizes.