There's a big bunch of HarperCollins price drops today. I'm hoping some of them drop over at Harlequin.com but so far I'm just seeing lower prices at Amazon and Google. Too many to link to so check your prefered store.
FYI - if the publisher is listed as Avon (in Red) the book will be available on the Harlequin site. If it's listed as HarperCollins e-books it more than likely won't be available there.