You've seen the large white erase boards... right? They are so handy but wow are they expensive! Here's a handy tip. If you need a large one, go to your local hardware store and purchase the smooth "shower board."
If you need a smaller one, measure and cut your board with a utility knife. We used masking tape to protect the board and help us cut a straight line. Score the board then gently break it.
You can even get edging to make the board have a nice finished look around the edges.
I purchased a 4 foot by 8 foot sheet for less than $10 and we used the clear mirror mounts to put it on the wall. It works perfectly!
You could also cut one sheet into several boards, decorate and give as gifts.
Have a great day!