With free scores on my website for more than 100 compositions from the 20th century I found it necessary to create a subpage to filter the available works via the instrumentation. So below is a link to the starting page and please check for your most beloved instrument:
https://www.tobias-broeker.de/rare-manuscripts/list-of-instrumentations/ (https://www.tobias-broeker.de/rare-manuscripts/list-of-instrumentations/)
Enjoy and hopefully you find the one or other interesting score for yourself. It's all free!
Best,
Tobias