Free again, probably just for one day @
B&N (may also drop in the
UK),
Amazon UK (new ASIN, slated to drop in the
main store after midnight Pacific Time),
Kobo &
Google Play (both available to Canadians),
iTunes (not free for Canadians, but free for at least the US & UK, may be a glitch exclusion that will drop in the morning), and
Christian Book (ADE-DRM ePub available worldwide).
Links edited into the OP, since it's been a while.