Until May 30th, acclaimed historical novelist Bernard Cornwell, OBE (
Wikipedia), is the featured Author of the Month at Kobo Canada (Kobo US has someone else), and nearly all his HarperCollins books are on sale for $4.99 CAD or less (probably matched elsewhere, since they're HC).
These include the Last Kingdom series (Anglo-Saxon England during the Danelaw, mostly $3.99, with two latest @ $4.99), the Sharpe series (Napoleonic Wars, mostly $2.99), and various standalones ($1.99-$3.99) NB: There are money-saving omnibus editions for the series books which are considerably cheaper, with various 3-book Sharpe bundles for just $4.99 each, and the Last Kingdom #1-6 omnibus at $8.99 CAD (previously on sale for $6.99 CAD several years ago) is cheaper than either of the #1-3 + #4+6 combined, much less the individuals, though not cheaper than $14.99 CAD for #1-8 if you don't already have some portion of the lot (#7 and #8 have been on sale cheaper than the current $3.99 CAD discount price).
Main feature page, with categories:
The Last Kingdom Series,
The Sharpe Series,
More from Bernard Cornwell (Grail Quest #1-3 are just $1.99 each, and there's a Special Edition of 1356 for $3.99 which says it has exclusive author content including an extended historical note, and is considerably cheaper than the non-SE at $12 CAD),
Bundles (for some reason, only lists #2-7 of the Sharpe 3-Book Colletion bundles, apparently the hypothetical #1 is MIA)