Thanks to the 20th anniversary. Until December 31st, 2027 at least.
English Sub: https://www.youtube.com/watch?v=SvsAOf9HWTs
English Dub: https://www.youtube.com/watch?v=oXpgvkvKzhw
It's a single (10 hour) video but has the episodes marked as chapters. Highly recommend Episodes 7 and 15, they're two of my favorites.
You can, of course, still pirate Mushishi but hey. 
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I found YouTube links in your post. Here are links to the same videos on alternative frontends that protect your privacy:
Link 1:
Link 2:
Link 3:
Link 4:
This show is so good. Meditative and interesting, occasionally horrifying, with a sweet core
Good for sleeping to, actually.
I was too lazy to torrent it all
