I bought a sponge of sorts advertised as for getting pet hair out of bed sheets. I've no pets, but stress makes me lose tons of hair and I've long hair. It works like marvel for my own hair! It's so life changing! I love it!
I was also able to get a mini white paint with a mini roller for practically nothing to finish off the wall fixes I was doing.
I also got a tiny brush meant for keyboards and discovered my keyboard was super nasty with my hair on the inside. >____<
I got an electric toothbrush last year, and my plaque buildup is way less than it used to be.
electric toothbrushes basically are the difference between needing the dental hygienist to scrape a bunch of plaque off your teeth every trip to the dentist vs going "hmmm someone flosses" when you actually don't
the rotating ones i.e. Oral B style heads are better than the strictly vibrational sonicare ones
I was avoiding getting one for years, because I gravitate towards lower-tech solutions to everyday problems. But the results really speak for themselves - it's probably something that everyone should invest in.