The best valued V3 bundle available at the moment is one of the Megpoid V3 expansion packs for $227.23 USD from Yamaha. For your money you get 4 vocals quite cheap. In order to purchase it you will have to use paypals or a third party site.
However, if your not interested in this or can't quite afford it;
With the exception of SeeU who is bought from Ebay thats where you get the pricelist of V3's.