Adobe InCopy CC 2015 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous InCopy customer). Adobe InCopy CS6 is still available for purchase (without a monthly plan) if you prefer.
Adobe InCopy CC 2015, ideal for large team projects involving both written copy and design work, provides copywriters and editors with a powerful tool to style text, collaborate through track changes, and make simple layout modifications that integrate effortlessly with InDesign.