Sorry, I can never remember what the function is actually called, and the correct link should be "tell us about a lower price" right at the bottom of Product Details.
Incidentally, it looks as if the Pink Collection is for the unpublished novels from her estate (while the Eternal one is for the actual backlist), and there's a couple of nice interviews with Cartland's son about the collection and his mother's life and work, if anyone's interested @
The Telegraph and
a fan's blog site.