Currently, iFixit offers the FixHub Portable Soldering Station as a complete kit, which includes both the Power Station and the Smart Soldering Iron. The Power Station isn't available for separate purchase at the moment.
However, you can buy the Smart Soldering Iron on its own if you already have a suitable power source.
For the most up-to-date information, I recommend checking iFixit's official website or reaching out to them directly in case they start selling the Power Station separately in the future.