Plyo boxes are an awesome, versatile tool to have around. And while you can certainly use stairs or benches for box jumps, wooden plyo boxes offer a higher, sturdier surface and last forever.
I love my Rogue plyo box and use it almost daily. It’s good quality, easy to put together, and you can choose whichever height you want. I use a 20″ box.
See workouts that use a plyo box here.