where is a good ddr machine in san jose
www.ddrfreak.com
And find "Machine Locations". It even has a search engine.
If you live in the San Jose area check out SunnyVale Golfland or Milpatas Golfland. I believe they might have Supernova 2. I still yet need to play one.
Milpitas has SuperNOVA 2. It's garbage in my opinion.