I need new pen for Wacom Bamboo MTE-450A

I have this rather old tablet, and it worked for many years, however last night pen stopped working. I believe something inside it broke . Basically, I am just looking for information as to getting new pen. Ideally something cheap that will work with this tablet. While I can just go get different tablet cheap as prices are much better now then when I bought this one, I'd really rather keep using this one.