Sleeving - $5.49 (x2) - https://www.amazon.com/gp/product/B00ACL49Q8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
2.5 TRRS - $5.99 - https://www.amazon.com/gp/product/B072F26CMZ/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
Sen. connectors - $9.89 - https://www.ebay.com/itm/332797189154
Wires - $22.00 (for 100 feet), I used 40 - https://www.ebay.com/c/1539185948
If I only count the 40 feet of wire, this comes out to $36 for a really high quality cable. You could certainly find some cheaper connectors though and I’m sure cheaper wire too.
I will say, soldering the 2.5 mm connector nottttt fun by any means, and jamming the paracord into the end was also super annyoing (I had to enlarge the hole slightly). The result is great though. If you can use XLR instead of 2.5 that would make the build about 5x easier…
You can probably see from the picture but I ended up just tieing the chords in a knot at the y-split. I thought it was kinda hack at first but I’ve since changed my mind - I think it looks nice with the paracord and it shouldn’t affect the sound in any way.
If you don’t like that though and you don’t want to spend the money on an ebay y-splitter, I’ve used the housing of a 1/4" connector before to conceal the split, that looks fine too.