I am so lucky to have a LA shop a half hour from my winter house. The thread that they carry is the Superior thread 'Omni' and 'King Tut'. Those are 40 wt threads made for the LA and I've been very happy with them. Superior makes other thread lines as well. Those are the ones I've tried. And, I've purchased from the Superior website as well.
https://www.superiorthreads.com