Slokas4All has the sahasranam along with the nyasa and several dhyanams.
The Sanskrit Channel has a playlist of five lessons that walk through the stotram slowly, and the final recording is a slow chant of the whole Lalitha Sahasranam.
Classes and practice sessions presented by Bhaskara Prakasha Ashram.
Background Info Videos
Performances of the sahasranam
Here is a beautiful performance, done slowly and meditatively.
Kuldeep M. Pai chants with very clear pronunciation.
And he has another beautiful video with his wife.
Another one to listen too. It's fast so it might not be the best for learning.