There are about a million (well, quite a few) Mills & Boon e-Book Collections (romance novels) available in the Kobo Singapore store. Just search on "Mills Boon Collections", and bunches and bunches pop up.
Just in a sad side commentary on the Kobo suggestion engine - I was searching for a good basic text on biochemistry and two of these collections were among the results
. Or maybe, I guess, good (bio)chemistry is needed to have a good romance...
I tested three or four without actually purchasing, and all appeared to be couponable in Singapore with the ubiquitous PERKOPOLIS. Don't know about elsewhere - I didn't check.