A total of 2 reviews of this product on Reddit.
18th Jun 2019
You could try AliExpress right now they are having a sale.
If not, this is the cheapest I could find on Amazon
KZ ZS10 Pro Headphones Yinyoo Over Ear Wired Earbuds IEM HiFi Earphones with 4BA 1DD Hybrid Balanced Armature Driver Dynamic Drivers 3.5mm Audio Plug Cable(Purple no mic) https://www.amazon.com/dp/B07QTPSTHM/ref=cm_sw_r_cp_apa_i_6-gcDbKHFFAMQ
9th Jun 2021