It seems to be two types of Three Star Route tickets.
Three Star Route Option Ticket sold by JR East. 5500 yen.https://www.jreast.co.jp/e/pdf/press_20190704_e.pdf
This is for foreign visitors only.
Sold at: The following JR East ticket counters
JR EAST Travel Service Center (Tokyo Station, Shinjuku Station, Shibuya Station, Ikebukuro Station, Ueno Station, Hamamatsucho Station, Tokyo Monorail Haneda Airport International Terminal Station, Narita Airport Terminal 1 Station, Narita Airport Terminal 2・3 Station)
JR Ticket Offices (Midori-no-madoguchi) (Narita Airport Terminal 1 Station, Narita Airport Terminal 2・3 Station, Matsumoto Station)
Travel Service Center (View Plaza) (Nagano Station, Matsumoto Station)
Three Star Route Ticket sold by Alpico Bus and Nohi bus. 6000 yen.
Alpico bus site (I believe Nohi bus sells the same ticket).https://www.alpico.co.jp/en/three-star/
Matsumoto Bus Terminal 4:40 – 21:00 Credit cards accepted
Hokutetsu Kanazawa Ekimae Center (Kanazawa Type only) 7:00 – 20:00 Credit cards accepted
Toyama Chitetsu Ticket Center (Toyama Type only) 7:00 – 19:00 Credit cards accepted
Japanese locals also can buy it.