Kobo is currently running a sale on Harlequin omnibuses in Canada & the US, through December 6th for $4.99 each.
I spot-checked one or two titles, which also seem to be discounted in the Harlequin store as well, so it's probably a publisher spotlight rather than an exclusive sale. There are 3-book sets by individual authors like Nora Roberts, Carla Neggers, Debbie Macomber, etc., as well as 4-book recent “line” boxsets collecting the monthly releases by multiple authors in the Harlequin Presents and Harlequin Historical and other subimprints.
Anyway, the dedicated sale pages are over
here for Canada &
here for the US, with categories:
Contemporary Romance,
Romantic Suspense,
Historical & Western Romance