I've done a ton of labs with students this month. We're learning about waves and there are some fun demos and experiments you can use to illustrate ideas.
My absolute favorite tool is: my cell phone and a ring stand with a claw clamp.
Don't put a ring on it.
I'm now super mobile and can film some sweet science action to use in videos, post on the website, and just generally have in my back pocket when I need something.
Like today, we were discussing how waves travel faster through some media (solids) than others (gases). So, I set up two rows of dominoes, one spaced tightly and the other less so, and let the science happen.
I have a lot of other examples, including a couple which will have their own posts...someday...maybe. If you don't teach science, ask your friendly neighborhood chemistry teacher if they have an extra stand and clamp. Or, just head over to Amazon and grab yourself a little phone tripod to have. It makes a ton of difference in how you think through teaching a lesson and the more you use it, the more opportunity you'll find.