Hey all, I'm looking at buying a P4, but I'm unsure exactly where to buy one. Sometimes buying directly from the manufacturer isn't always the cheapest route. Should I buy from DJI or another site? Should I buy extra batteries while buying the drone, or aftermarket ones? Are there "Fast Chargers" for batteries that charge batteries faster than the stock charger? Was there a "Black Friday Sale" last year at DJI, and if so, was the discount deep enough that I should wait until Black Friday for a possible deal? (I'm in no hurry) Is DJI coming out with an upgraded model I should wait for? Thanks all!