Here are some popular free Vocaloid 5 voicebanks:
You cannot legally get every Vocaloid 5 voicebank for free. However, you can produce full songs using free versions if you know where to look. Vocaloid 5 Voicebanks Free
If you are a student at an accredited music college: Here are some popular free Vocaloid 5 voicebanks:
. While the software is paid, these specific voices do not require a separate purchase. VOCALOID 6.6 Update: Vocaloid 5 Voicebanks Free