A few sf/fantasy bargains I noticed at Kobo for $2.99 each unless otherwise specified (likely price-matched elsewhere as well, valid for Canada and probably the US) but I'll just provide the links there since at least one is couponable:
In Winter's Shadow (couponable) by Gillian Bradshaw (
ISFDB,
Wikipedia), 3rd in her Down the Long Wind trilogy of YA Arthuriana. All three books in it placed on the Locus lists for Best Novel of the Year nominations, and this Sourcebooks edition is reprinted from the 1982 Simon & Schuster original. The 1st in series was a
deep-discount sale title a couple of years ago, which you might already have picked up.
Etiquette & Espionage (not couponable) by Gail Carriger (
ISFDB,
Wikipedia), the 1st in her Finishing School series of YA steampunk + paranormal boarding school adventures, which is a prequel series to her popular Parasol Protectorate quintet, set some 50 years earlier in the timeline, out from Little Brown & Co.
Some titles from Orion's Gollancz imprint (not couponable in Canada):
Altered Carbon &
The Steel Remains by Richard Morgan (
ISFDB,
Wikipedia), a hard sf suspense (1st in Takeshi Kovacs series) and a fantasy epic adventure respectively.
Revelation Space by Alastair Reynolds (
ISFDB,
Wikipedia), a space opera epic, 1st in eponymous series.
The Lies of Locke Lamora by Scott Lynch (
ISFDB,
Wikipedia), 1st in the Gentleman Bastard series of fantasy adventures. There's an omnibus editon of the first two books available, but actually at the current prices it's cheaper to get this one at $2.99 on sale, and then even if the $9.99 of the second doesn't drop later, it's still a $1 savings over the current omnibus cost.
The Blade Itself by Joe Abercrombie (
ISFDB,
Wikipedia), 1st in his popular The First Law series of darker-and-edgier high fantasy heroic adventures.
I don't know how long the prices will last, but Carriger's book has been on sale for the past week, probably to promote the upcoming new one, and may stay a while longer, and the Gollancz things weren't discounted a week ago when I checked on something else from them, IIRC.