How do you get vst plugins for cubase free?

Just google free vst plugin, there are many, though I have downloaded a few as part of making Dubstep, techno music for PumpYouUp.com and none were really worth the effort and generally worse quality than free synths or effects that come with most music software/soundcards. Sylenth and/or Massive is likely what you want, they are a bit of money but well worth it.