https://en.wikipedia.org/wiki/Flutazolam, from Japan. It has an elimination half-life of about 3.5 hours compared to 11-16 for xanax. Valium is around 50 hours IIRC.
I also tried etizolam, which has a half-life around 3.5 hours, but its active metabolite has a half-life around 8, so the effect tended to hang around a bit into the next day. Apparently flutazolam also has an active metabolite that lives longer ... but it never seemed apparent.
At the time both of these were freely and legally importable into the UK where I lived. This is no longer the case, and that's probably for the best - RC benzo use was getting to epidemic levels.
(incidentally, reading up on this, I have realised that xanax is not a lot longer lasting as I initially said, it's actually pretty short acting for a benzodiazepine, around 1.5-2x as long as flutazolam AFAICT)