Is there a cheap digital notepad for everyday needs?

I live in a shared apartment. We were wondering if there were like a digital notepad we could stick to the refrigerator. It may/may not have handwriting recognition but should enable us to scribble notes on it (like shopping lists, information etc). Ability to do basic maths is a plus, but not required. Does anyone know of such a device at a reasonable price ($100-$120). Thanks in advance.