You're correct that these units have been at the $139 price since they were originally introduced, but they were only in the flyer for a week. I noticed my location moved them out of hiding again last week, so it isn't a surprise to see them in the flyer for another go.
I don't believe this is the regular price though, I expect these to go up to $199 early in the new year. The old gen2 sets in the same package (2 batteries + charger) are still holding at $199.