Volleyball isn't that rough of a game so there aren't that many injuries. One of the common injuries is twisted ankles or something to do with the ankle. You can always buy active ankles to help you if you do a lot of hitting and blocking because one time you may come down on it wrong and get seriously hurt. Even though most of the time you see women's volleyball, there are men's volleyball teams out there and they need to take the same precautions as well.
One other thing that you need to have when playing indoor volleyball is the right shoes so you don't slip on the court. Women's shoes are going to probably be easier to find, but you can find mens discount volleyball shoes if you look hard enough. Or you may just want to take the easy route and buy shoes full price because you don't have the time.
Discount men's volleyball shoes may be hard to find, but so are men's volleyball uniforms. After you find them, they may have a limited selection since volleyball is looked at as more of a ladies sport. Something that may be even harder to find are men's red and white volleyball shoes. But whatever you decide, you'll look great on the court!