I just bought my third round of underpants from Modi Bodi as I’ve been using them for years and my first couple of sets finally wore out.
They are excellent value for money, I’ve saved so much on pads and tampons, plus keeping all that plastic waste out of landfill.
I also sleep better at night because I’m not worried about leakages.
Their website is really informative so it’s easy to make decisions about what suits you.

Approximate cost: $30