Can i buy DJI Care Refresh (Mavic Pro) on its own even if i am buying the drone from a third party site ?
Also i have coincidence about some of the things i am reading about the drone flying off ect will Care Refresh cover it if it flies off  crashed or lost ?

I emailed support couple weeks back.
This is what they told me

"After you received drone within 48 hours after it is been activated , you can buy dji care with SN code."
http://store.dji.com/product/dji-care-refresh-mavic-pro

Ken- wrote
"If you crash, you send it in and you will have the option to pay for the repair or use your Care Refresh.
If it's a $100 repair, I'd pay for the repair. If it's a $500 repair then I'd use the Refresh and get a new Mavic."

I dont think it covers lost because you need to send the drone in.

Here is a similar threads you might want to look at:
http://forum.dji.com/thread-67687-1-2.html