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Yes, if you have an older edition of a book, you can receive 40-50% off the purchase price of a newer edition (40% discount for print books, 50% discount for ebooks).
To get this discount, you need to register your book by going to http://www.oreilly.com/register. If you don't have a free oreilly.com account, you'll need to create one before you can register your books.
If you have any trouble, contact our customer service department:
Associate Editor, Missing Manuals
So sorry about this, but I think there has been some confusion created about this. Dawn is correct if you own an older edition of a title then you can get the discount she described.
Unfortunately OS X Mavericks: The Missing Manual and OS X Yosemite: The Missing Manual are two completely different books, and OS X Yosemite: The Missing Manual is not a new edition of OS X Mavericks: The Missing Manual.
I will write you directly concerning this offering a solution that I hope will please you.