VentureBeat writes, Due to low stock of the iPhone 3GS, Apple Genius Bar employees will now be offering reduced service options for the old model and instead making a hard pitch for the new iPhone, which is expected to be announced at an upcoming launch event later in September. Our pals over at 9to5mac were sent an internal memo to Apple Genius Bar staffers stating that as of now, “The service options for the iPhone 3GS are: perform display repairs, discuss advantages of buying a new iPhone … use on-hand inventory for swaps.” The emailed memo goes on to say that if the store in question is out...