I'll start with a few good products.
Vaseline
Petroleum jelly. Now here is a product that delivers a lot of value and versatility.
You find it in the baby section, because it's used for diaper rash. And if you have a baby with diaper rash, you'll probably go through a few jars of it.
If you're a male adult, with no babies, and you have purchased one of the large jars of Vaseline for your personal use, it'll probably last years. There are two main reasons you have made this purchase: 1) Hemorrhoids. It's the poor man's Preparation H. 2) Sex lubricant. Once again, the poor man's lubricant. You can pay a whole lot for fancy lubricants, or you can save a bundle with petroleum jelly. I did read that water-based lubricants are the safest with regard to infection.
I also once saw a man get a stuck window freed up with it. Versatile, like I said.