Tales of Monkey Island is back to the GOG store! No official announcement has been made so far. Kudos to karnak1 for finding it.

I am also seeing a 50% discount, not sure how long it will last.

Did they actually fix the audio bug?
https://www.gog.com/forum/tales_of_monkey_island/episode_2_bad_voice_quality/page1

If not it would be a good idea to contact the developer and let them know about it.

They aren't easy to find but apparently LCG Entertainment is using the Telltale brand. I contacted them using the form in this page: https://www.telltale.com/player-support/

Hopefully they will give us an answer.

Yes, I got an email saying a wishlisted game was on sale and I was surprised to see it happened to be Tales of MI. I'm glad I'll eventually be able to complete the series collection here on GOG, this is the only one I'm missing, though it will have to wait for a while as I'm broke and drowning in debt, lol.