Many clients are expressing frustration with contractual obligations to use in-house audio/visual. This can be avoided with an outside audio/visual clause in your contract. As you are selecting your venue and space, include our team in the process. We can assist with contractual language.
Other rates you can negotiate include internet, rigging, power, patch and dock/freight fees. You should not be penalized for using outside audio/visual. There are other benefits to using outside A/V companies too, such as cost savings, higher skilled techs and engineers and the best and latest technology in equipment.