Help Please: Amazon has all sorts of these props that say they are genuine OEM DJI 9450 props but at all sorts of prices... I would like to get these props by prime delivery for a wedding Saturday. Any advice on where I can get a good price on a set of 9450's for my Phantom 1? Also: Do I need to balance the props if they are brand new and added to a brand new Phantom 1 version 1.1.1? Change any of the settings with assistant software in regards to thrust etc? Thank you very much for the help!