Need some reliable way to get chaos res in act 3.

Ive played through the campaign probably about 10 times by now. Nearly every single time i get to Viper Napuatzi without finding any significant chaos res gear. Please just make the town vendors always sell amethyst rings or something.

2 of the attacks in that fight can 1 shot my bear Shaman through 2k armour and 1k life. Napuatzi chaos rain on a crit (purples circles that cover the ground), and then the spear guys green attack. (I dont know for certain what the spear guys do since i cant find them on PoE2db ((and there is no way to figure it out in game)), but if they can 1 shot my bear so i really doubt its just phys/ele.)

Then of course there is all the chaos DoT, but at least you can manage that with flasks and regen.