As you know, the NVIDIA Jetson TK1 Development Kit is a development kit for the SoC Tegra K1. Now that chip is available from NVIDIA Partners individually. Here in the USA, the chip is available at Arrow.com.
Read more about the Tegra K1 and find distribution partners in your part of the world on the Tegra K1 Chips Page.
This should make it easier to build limited runs of specialized hardware builds incorporating Tegra K1.