Thru July 31, Harlequin has 21 eBooks on sale for $1.99 each. These will have DRM, so can't be read on the Kindle, but can be read on your PC or any other device that supports MobiPocket Reader. These look to be split between their Presents, Blaze and Desire imprints, so all romance, in varying degrees of heat!
$1.99 Romance at eHarlequin