Get an Boogie Board, the Erasable Writing Tablet for $37.40
Here is an extremely affordable and handful tablet that you can use to write and draw. The erasable tablet comes with a sealed watch battery that you can rely on for hours and hours. Commonly known as the Boogie Board, this device comes in 2 sizes: the 8,5 inch and the 10.5 inch. It is ultra thin 1/8' and very lightweight. The device also comes with a really durable LCD screen that is shatter proof. This is probably an unconventional tablet, but for the price, you should consider trying it out. It has its use. The long life battery is probably its greatest strength.