Yes you have to buy Data Bridge to get Data Assist, but you should get a significant discount based on previous purchases... it can cost as little as $150 if you owned the various tools included in it.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.