User blog comment:MeerkatQueen/Where to Buy VOCALOIDs/@comment-6433273-20190427194034

http://characterplanet.net/shop/

The Character Planet shop seems to be down. Don't know if it's perniment or temporary.

you can still get UNI's dl there though (als also in the VOCALOID shop)

Either way, from what I can tell, there is currently no other way to purchase SeeU.