I'm going to bed now, and haven't had any luck I'm afraid. However, this page describes the CD as being as being [very] hard to find.

It might be worth posting a message to the Elton John Usenet Forum

Another option might be to buy the vinyl album and make a CDR from it (or get someone you know to do it if you don't have the equipment)

That way your wife would have a unique CD! Now, that whould get you brownie points! *grin*