My sis wants to order

Night Road ($9.99 Ed.) (Reading Group Gold)

What does it mean when it has  ($9.99 Ed.) (Reading Group Gold) included in the title?  Never saw that before.

That looks like it might have been a special ISBN to track those versions of the book. For a book club? Sometimes publishers will use a different ISBN for types of stores. I've seen one specific one used for Religious gift shops. 

I know similar markings are used for copies that have Book Club questions in the back. Or aimed at teachers. 

Basically, the PBS computer collects the database information. If the distributor had additional notes that used the subtitle format, then they show up in the PBS title. Then PBS volunteers have to research and edit the data. 

ETA   Looks like this was a special discounted release under it's own ISBN.

Amazon lists the book with ISBN 9781250059871 as a deluxe edition. If you click on "See all 3 images" on the Amazon listing for this ISBN and move your cursor over the image and click on it, you will see an enlarged image. Moving your mouse to view the lower left corner of the image clearly shows the Reading Group Gold logo. It is unclear if the bright red circle is part of the image or if it is a sticker. If you look at the EAN bar code on the back cover of the book from the Amazon page you'll see it priced at $9.99, and the publisher information designates it as "St. Martin's Griffin; Special edition, Value Promotion edition".

The price information should definitely not show up in the book title in the PBS listing and a data edit should be submitted to correct this. The (Reading Group Gold) designation in the title may be OK, but I'm not certain. Any data approvers out there care to weigh in on this?

I just submitted an edit to take the extraneous info out of the title line (and clean up the description).  It may take a week or two before the change is approved and shows up.

That's a Macmillan Publishing group read.  It's a book club offered by the publisher.  It was probably one of their featured books.  I don't know for sure, but it may have been a special price offered to the group members.