Books   |   'Potter' fans put hex on marketing July 15, 2005 BY HILLEL ITALIE ASSOCIATED PRESS As publication nears for "Harry Potter and the Half-Blood Prince," to be unveiled to the world Saturday, expect some of the usual midnight madness and at least one new twist: less Potter merchandise. "We've got Harry Potter pens and bookmarks, and a few of those types of things. But that's really it. There definitely will not be as much as the last time," says Beth Bingham, a spokeswoman for the superstore chain Borders Group Inc. "I told the staff not to sell any of it," says Gayle Shanks, owner of the Changing Hands Bookstore in Tempe, Ariz. "We failed with it last time. It was really pricey merchandise for pretty bad stuff, to be honest." Potter paraphernalia, from cakes to capes, was on display everywhere when J.K. Rowling's last novel, "Har

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