The kits include all of the main cables, so PCIe, EPS and 24pin, while the $30 options are single 12VHPWR cables.
This is the compatible single cable: https://www.amazon.com/CableMod-ModMesh-Sleeved-12VHPWR-Seasonic/dp/B0BJ29KZHL?ref_=ast_sto_dp&th=1
This is the full kit: https://www.amazon.com/CableMod-ModMesh-Sleeved-12VHPWR-Seasonic/dp/B0BJ34C92D?ref_=ast_sto_dp&th=1
Already released actually. :)
Individual 12VHPWR Cable: https://www.amazon.com/CableMod-ModMesh-Sleeved-12VHPWR-Seasonic/dp/B0BJ29KZHL?ref_=ast_sto_dp&th=1&psc=1
If you'd like those items quicker, as mentioned above, we do have inventory at Amazon as well. Take a look. :)
Backplate side the cable routes up, cooler side the cable routes down. :)
For your PSU you would want this cable: https://www.amazon.com/CableMod-ModMesh-Sleeved-12VHPWR-Seasonic/dp/B0BJ29KZHL?ref_=ast_sto_dp&th=1&psc=1