Flesh and Spirit by Carol Berg is £1.99 at Amazon UK at the moment. This is a new Open Road edition (from just last month) of the first half of the Mythopoeic-winning Lighthouse Duet, and the old Ace edition wasn't even available here. I would guess they might be doing the same offer in the US.
https://www.amazon.co.uk/Flesh-Spiri.../dp/B0D9352C9T