I bought yet another copy of this album, and found there is actually a third combination of distributor and price.
Here is the relevant picture:
https://i.imgur.com/IyOzKAi.jpg?1
On the left, the album is priced at 2800 yen, distributed by Warner/Pioneer. In the middle, the price has been lowered to 2627 yen, and is still distributed by Warner/Pioneer. On the right, the price is still 2627, but the distributor is now Nippon Columbia.