There are many modules available at their official website. Please let me know if you are looking for any specific module..Thanks,
Do you have any specific one that you are looking for? I have MANY that I have collected overtime. There are only a handful located at the official prestastore and most of those are for payment modules. All the really good free ones are scattered throughout the forums. If you tell me what you are wanting a module for, I may already have it and can send it to you.