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You can purchase them from Nico Nico Douga.
You can get them on Youtube, Nico Nico Douga, VPVP wiki, Deviantart and many more places just look and you'll find what you need.
World is Mine was first uploaded on May 31, 2008 on Nico Nico Douga.
Nico Nico Douga was created in 2006.
Kumikyoku Nico Nico Douga was created in 2007.
vocaloid is not a show, it is a software that you put in melodies and lyrics to make them sing Good places to watch Vocaloid are: Youtube and Nico Nico Douga.
You don't need to pay to watch videos on NicoNicoDouga. You'll need an account, which is free. Although there are live broadcasts, for which you need a premium membership to be able to watch.
Youtube Nico Nico Douga
As of 15 Aug 2012, there are over 43,000 original songs just from the Nico Nico Douga website with the tag ミクオリジナル曲 (translated: miku_original_song). This doesn't include videos that have been tagged incorrectly that feature Miku. There are almost 14,000 cover songs featuring Miku. On other websites, such as YouTube, there may be hundreds to even thousands more original songs. At a minimum there are 57,000 songs featuring her. Going back to the Nico Nico Douga, if we add up the rest of the Vocaloid songs posted there, the total number of original songs, including those with featuring Miku, is over 83,000. For cover songs, there are over 30,000 using Vocaloid, including Miku. Not even counting the unique uploads on YouTube and other websites, we're already over 110,000 songs featuring a Vocaloid.
The other site that is big on Vocaloid is Nico Nico Douga.
Piko is 25 years old as of March the 11th! <3
She is a utaite (Singer) from Nico Nico Douga, and she impersonates Kagamine Len (Vocaloid). She is well-known for her lower range of vocals and sometimes said to be one of the best Len impersonators.