I've looked all over for the Actron fitting by itself, and their kit that includes it, and though both are listed currently on their website - looks like everywhere that used to sell it, doesn't anymore. The parts appear to be discontinued.
Through some digging I found the OEMTOOLS equivalent part # and the picture shows it to be the exact same part as the Actron 95304. OEMTOOLS 27167B - and Jegs shows it "more than 10 in stock" at $16.99:
https://www.jegs.com/i/OEMTOOLS/693/27167B/10002/-1
Apparently it was included as part of their whole pressure test kit 27167 which may no longer be available, but there seem to be some of the adapters still floating around. I also can't find anybody else right away with the adapter in stock except Jeg's so it looks like they're fading quickly.
In the spirit of "put your money where your mouth is" on seemingly discontinued items, I bought 2 just to have in my tool backstock so I can continue working on TBI vehicles in the future. Not needing anything else from Jegs at the moment I paid a bit of a premium but it does appear they're on their way at $26.50/ea after shipping and tax, but still not painful at all for a hard-to-find item.
Now to see if they actually arrrive!
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Richard