So where do you buy replacement cables for these? And are there third-party cables that are compatible with this model? if so, can you name a couple reputable brands that provide secondary cable options?
element72They use the standard MMCX connector so there's tons of aftermarket cables for these.
Just to name a few, sgaudiohive, null-audio, effect audio, alo audio, toxic cables, nocturnal audio...
Tho most of those are ridiculously overpriced. For a cheaper alternative, look at Amazon and Ebay for something like "mmcx iem cable" and you'll find plenty that are around 20-50$.