There are many companies that sell live chat. The prices range from free to hundreds per month. If you are a small business and need only a few operators. We suggest using the live chat module offered by an Austrailian Company named 'Star Develop'. Have a look - http://livehelp.stardevelop.com/pricing.htm. The cost for us to install their app in your Sophio webstore would be billed on an our hourly web mastering rate, usually one or two hours.