The headers on the board are documented in the Technical Product Specification, which is available here: https://www.intel.com/content/dam/support/us/en/documents/mini-pcs/nuc-kits/NUC8i3CYS_TPS.pdf.
The one place that I know sells compatible cables is Micro SATA Cables (a.k.a. GORITE). They are U.S. based, but they do ship internationally. Here are links to the pertinent pages on their site:
Micro SATA Cables also has a presence on Amazon. Here are links to pages for these same products:
Hope this helps,
Thanks a lot for the useful links, n_scott_pearson!
But I'm afraid I won't get the cables in the reasonable future from this store due to the pandemic situation.
As far as I've understood from the TPS there are 1.25/4pin connectors, so I'm going to find them near me.
Thanks a lot!
I ordered two of the 8 inch cables from Micro Sata Cables on 10th august. I'm in the UK. They arrived yesterday, which is pretty speedy from the US. Kudos to them, and they work perfectly. I use a wireless mouse and keyboard each with a small USB2 receiver. These now live inside the NUC on the end of the USB2 extension cables, freeing up two much more useful USB3 Gen 2 ports. Perfect!