most of the so called "surround speakers" have higher impedances. They should be cheap, maybe only sold as pairs.

For a really small application you could also use a 8Ohm type and use a series resistor of 8.2 Ohm if you are using a small headphone amp and are not bothered to get max SPL

You can also destroy some cheap headphones. Most of these speakers are 32Ohm.

Werner