Bargain @ 99 cents for US-only from the "HarperCollins e-books" imprint:
There's a whole slew of historical fiction (and assorted period-set litfic), including a lot of westerns.
You can probably try getting them at the OmniLit 50% rebate Hallowe'en sale mentioned in GeoffR's
alert thread and also be eligible for the Buy 10 Get 1 Free deal, or they're cheap enough that you can go to your favourite US store for them.
Here's the
Kobo auto-search for the imprint, sorted by price and filtered by category so you can scroll through and spot if there's anything which looks interesting to you.
Also, some more specific category filtering for
Historical and
Western, though occasionally things get misfiled.