Yes. You can find the complete list of over 1000 albums on MikuDB. See related links.
You can get VOCALOIDs from their own companies: Zero-G ltd. Dear Stage PowerFX Crypton Future Media I-Style Project Bplats. Inc Internet Co. Ltd. AH-soft YAMAHA (you can even buy all VOCALOIDs from there, including their own VOCALOIDs) Ki/oon, or Sony Japan 1st Place (It's a company) SBS Artech Y2 Project VoctroLabs
there is a game based on vocaloids, but originally its a program.
Well, if your going in chronilogical order it goes: First generation vocaloids (MEIKO, KAITO, ...etc) Second generation vocaloids (Miku, Rin, Len, Luka...etc) Utauloids or UTAU's (Teto, Neru, ...etc)
Probably utauloids
Thug Drama does his own production on his albums.
No. VOCALOIDs are not couples. VOCALOIDs do not have to deal with anime or couples. It's only a singing program.
There are a lot of VOCALOIDs. VOCALOIDs are now up to at least 45, and their are more than 60 voicebanks.
There is no any other VOCALOIDs. All vocals found in VOCALOID wikia are the original VOCALOIDs made buy actual music/recording companies. Haku Yowane, Akita Neru, and Hatsune Mikuo etc. are fanmade based of the VOCALOIDs voicebanks.
yes
You can't get Vocaloid for free, but there is a programme called UTAU which is nearly the same thing; you can also make your own Vocaloids on that.
around $200
Every VOCALOIDs have diffrent prices. The cheapest VOCALOID is currently $40 dollars and the highest price is about $400. You can buy the VOCALOIDs in their company's website.