Magnetic Dry Erase Whiteboard / Table MagnÃ©tique effaÃ§able Ã sec

This one is $125 (a wee bit out of your price range), but a bigger one is best found used for that price (only small ones are under $100). You can also try white board paint. Try Kijiji.ca or Craigslist.org for the used whiteboards.