Since someone already mentioned dashcams and cast iron, my vote is: a bidet toilet seat attachment.
Fancy ones can roll $200+ but a super simple one with just a cold water hookup and no electricity will knock you back $50-60. I bought one right as covid was beginning to hit the west coast, and instantly realized I could never - ever - go back.
Huge bonus of the toilet seat style bidets is that, since you aren’t actually replacing the toilet, they take like 5 mins to install and can be done in a home, condo, apartment, wherever.