Well, you're best off ordering from Dr. Chronic or Gyspy Nirvana (seedboutique.com). They're known to be reliable.

Dr. Chronic has it here: http://www.drchronic.com/products.asp?recnumber=155 However, it's currently out of stock. But, it sounds like you're a nube (no offense intended). You most likely will not get 600 grams off of it, at least in your first grow. Indoor yields less than outdoor generally.