Hi Becky. Unfortunately they do go brittle with age and the damage to yours is very typical. After gluing mine together many times I spent ages looking for a replacement and got lucky with finding one on ebay a few years ago. Apart from the bay I can only suggest Martin, but I guess you've already asked him.
If you do eventually find one get it in the sink and give it a good scrub, the surface deteriorates over the years leaving the dull grotty looking finish, the muck that comes off them has to be seen to be believed.
Good luck with the search.