They did a new one a few years ago but it had pretty much all the old cakes in it as well as some new ones (I have both )

I just did a search for you and WW have released a newer version still which is called Party Animals.

The only suggestion that I have is ringing Magshop as they sell all the WW products and do their subscriptions and seeing if they have any left (you may be lucky - there may be a box out the back somewhere)

Otherwise try second hand bookshops.

Good luck