Sri Lakshmi Gayatri Mantra 108 Times | Powerful Mantra For Wealth & Luxuries
https://www.youtube.com/watch?v=ugWlHwkOlfM
Note that I am not in a position to make any kind religious endorsement of this or any other videos! Consider the source!
I'll hit that a lot, but it looks like I'll mostly be tossing "Diwali" and "Lakshmi" into the Youtube search function, perhaps along with you.
PS - I swear that video was available at higher quality last year.
It would be interesting to know the history here, as you say, since there might be, to some degree, a response to Christmas involved amongst the diaspora? Such a response apparently underlies the current Jewish celebrations of Hanukkah.