Saw a pin of a similar name and it got me thinking...

For me and my family I'd say
Cloth diapering
Buying clothes for me and kiddos second hand
Meal planning (less food waste)
Buying (mostly bald) DH his own super cheap shampoo/conditioner instead of him using what I'm using...
A combo of ebates and ibotta

Didn't mean to but I guess that's in order of most money saving!

How bout you!? Looking for more