If you're interested in Arthur Ellis Award-nominated archaeological antiquities mysteries, Canadian backlist re-publisher Bev Editions is offering one free title in the late Lyn Hamilton's popular "Lara McClintoch" series,
The Celtic Riddle, and 50% off with coupon
The Moche Warrior (for $2) as part of the Smashwords July summer sale (ending today). You may already have the 1st in series,
The Xibalba Murders, which they gave away free during Read an Ebook Week.
Here's the
publisher's page where they're also offering other free-with-coupon/discounted titles (including non-fiction, more mystery, litfic, etc.), which I highly recommend picking up if you've any interest in Canadian literature and/or history/sociology writing.