There are shockingly few images of mitochondria available online.

I started a project to increase that number by 1,000,000x: https://powerhouse.breckyunits.com/

I'm currently mastering the same confocal fluorescence technique used in this image (but borrowing microscope time, as the scope costs >$250K), but also developing an at-home protocol using Janus Green that should cost less than $200.