We've likely created a small industry for reselling drones in South Korea

[GadgetGuy]

this is the important point: only consider products shipped by Amazon. That means they are fulfilled by Amazon and that is the only way you can be protected by Amazon's return and refund policy

Absolutely correct, because anything else, even if Next Day Prime or Two Day Prime, unless it specifically ALSO states "Shipped by Amazon" is the worthless A to Z Guarantee in the Wild West of crooked third party sellers who will screw you over any way they can, with Amazon backing them up, taking their side every time, with 50-100% restocking fees for their deliberate screwups like sending the wrong merchandise or selling used returns as new, or shorting the quantity of batteries, or just never shipping at all!