What is something you started doing that ended up saving you money, when saving was not the initial goal?

So I'll start: I began cutting my own hair rather than going to a salon because the place I had been going to no longer has well trained people. The last time I went they royally ruined my hair so I decided I was going to learn how to maintain it myself. I knew what I likes and had a little bit of experience with it already so I didn't want to continue trusting someone else with my hair.

This decision has saved me roughly $200 annually and I don't think I will ever go back to a salon unless I want a specific treatment done.