Having been active in the industry of online acquisitions for half a decade I would strongly recommend you to consult with a broker who specialises in online properties, as bricks and mortar M&A firms typically don't have the necessary knowledge to provide you with an accurate valuation, or the contacts to find your business a qualified buyer when the time comes to sell it.

You're welcome to speak to either my team (I run the brokerage division of Flippa.com called Deal Flow - http://dealflow.flippa.com), or other reputable brokers in the industry, such as Quiet Light Brokerage and FE International.

Best,
Bryan