www.aliexpress.com is filled with these things. They look exactly the same as the original, but the hardware stats suck.
I got a Note 3 bout a couple years back.
They do look exactly the same, but the hardware specs are lower.
But I wouldn't say they suck, they are actualy quite good considering the price you pay.
In fact, for the price you pay I would say you get a sweet deal
The hardware they use is subpar even compared to a shit phone on the market. It has undergone 0 testing and are considered very dangerous.