Hi and welcome to the board. I have a feeling you may have to get a new cutting board. You may be able to salvage portions of your big one to take to classes and such.
I just logged on to Joann.com and they have a 50% off code for any non sale item. The code is WHF198. I then did a search for cutting mat and the Olfa one in your size is not on sale and is regularly priced at 49.99 so with the coupon code you can get it for $25.00 plus shipping.