Hey bro,
Remember me? I'm your neighbor who said hello to you in your intro post a day or two ago.
If you want to buy on eBay, that would be okay if you pay by paypal AND you are sure the seller is a DJI authorized seller. Because otherwise, you won't have a warranty.
You should look at reburbished being sold by an authorized DJI seller. Everybody has been throwing roses at the reburbished Phantoms. They are returns. BUT, they're fully warrantied by DJI and they've been given a once-over by the DJI techs. All the comments on this site that I've seen are completely positive on the reburbished Phantoms. If I was going to buy a new Phantom today, I'd buy reburbished.
In fact, this is the one I'd get, and if it was me, I'd click on "add to card" right now (it's got better distance than an Advanced and it has a better camera):
DJI Phantom 3 Professional with 4K Video (DJI Refurbished Unit)