There are a few pieces of gear I think every photographer should own, and near the top of that list is a 5-in-1 reflector. Today only, you can get one (or a few extras) for half off.
The reason I think every photographer should own a 5-in-1 reflector is because they're so cheap and versatile, and they're useful whether you're just starting to learn about lighting or you're a seasoned pro. They can be used with natural light to fill in some shadows or warm up the color temperature or in a clamshell configuration with a studio light overhead. My personal favorite use is unzipping and removing the reflector panel, then attaching the translucent core to a light stand to provide a soft, diffuse light, even in harsh midday sun. It allows me to shoot portraits and headshots basically whenever with minimal equipment, and it provides a nice catchlight. Whatever your personal use, though, you should always have at least one of these lying around, and today, you can get this 42-inch 5-in-1 reflector for just $24.95, half its normal price.