I have not been able to find these ones in FLAC anywhere.
I would appreciate links of any of the scores and the expansions.
Thank you!!

These posts have ME 1 and ME 3, I can't find links of lossless for ME 2 though.

Thread 126974
Thread 126974

Thank you very much for pointing me in the right direction! I always search thoroughly before asking for help, but I skipped these posts somehow. Great find! MP3 will do for now but I would love to have 2 in FLAC as well.

Look here

https://rutracker.org/forum/viewtopic.php?t=3149173

https://rutracker.org/forum/viewtopic.php?t=3969843

https://rutracker.org/forum/viewtopic.php?t=1192212

and for mass effect 2

https://bitsnoop.com/mass-effect-soundtrack-collection-o-q66460437.html

Thank you.