Home contents insurance - what I think is called renter’s insurance in the US. It’s not much money for peace of mind.
Medical inc dental (I’m in the UK).
I always get travel insurance when travelling abroad, even within the EU when almost all medical costs were covered. It cost hardly anything at all. In fact, until my health went down the pan I used to pay about £25 a year for worldwide travel insurance if it didn’t include the US, and something like £50-£60 including the US. That’s for unlimited trips and even included weekends away in the UK.
Nowadays I have to pay a lot more, about £250, because of my health. But I’m more likely to need to use it, so it’d be even stupider not to get it.
My employer provides private healthcare insurance at a massively reduced rate. I only get the most basic plan because my wide variety of pre-existing chronic conditions means there isn’t an awful lot left to cover. But it’s going to be something like £46 a year, so I might as well. And the most basic dental insurance, which doesn’t cover implants (well, they contribute a small amount, but nowhere near the cost of an implant), but does seem to cover everything else, is another £40 a year. It’s worth it just for the check-ups and clean and polishes.
Currently I don’t have pet insurance because the charity I got her from provides very low-cost care (though I always pay more than necessary) and they happen to be a very good vet, so I’d rather stick with them.