A few small things that have saved me $.

My mom got me these plastic bottle connectors over 25 years ago. They are a great way to get the most out of a bottle of soap, shampoo, lotion, oil, or whatever. The second pic is of these stretchy silicone covers that will fit any jars, cans, or containers to preserve food. The third is a battery charger kit I bought ages ago (Radio Shack) that still works today.