Found these on AliExpress:
1000 pixels for that price seems FAR better than others I’ve seen. Most seem to be half that many pixels (or less) for not much cheaper. Think this is something to consider buying, or it is just asking for trouble?
These are very likely just fine.
They come in strings with 50 LEDs each, I’ve bought one for 8 euro recently. That would be equivalent to 160 euro for 1000.
The offer you found is quite good 