This. It's a gamble. Not a massive gamble.I bought an Imporx 10x PTZ from Aliexpress. Your not going to get the service, communication, free returns, speed of delivery, etc... that you get from Amazon. BUT, what you will get is a price far lower than what Amazon can offer. When dealing with a China based company it is a gamble. So, you need to weigh with yourself, price vs the other stuff. Oh, my purchase turned out fine.
I would always pick Amazon/Costco over Aliexpress or any other Chinese shopping site, but there are some products you just can't get from either one and leaves you no choice. Of course now I see a lot of products that are available at Aliexpress are also present on Amazon with prime shipping and in some cases the price difference is negligible.
The costco 90 day return does not apply to security cameras or NVRs. You can return anytime.Thanks for the inputs! I am a newbie, and I think it might be better paying little extra and get peace of mind... I think Costco has the best return policy. It used to be forever, and as people abused that, they only let you return within three months for cameras (not sure whether security camera is considered "camera" on their website)