Zero 2 is "too good" option for Black Friday, Its the latest model too, so you will not need to worry about latest updates.
You can also look for other brands too, for Black Friday, because it all depends on what you want most from a smartphone.
Hot2 2 GB RAM is already being demanded and sold very much, so they will not keep it for Black Friday.
Usually, the "sale" is for items that were sold less than expected.
So all those things offering "high savings" are the ones which are sold less than expected.