You can buy one here
http://buy2gig.com/System-Enhancement-Module.html
It will allow a Honeywell Vista 15P or Vista 20P to work with all the Features of Alarm.com, Communications will be via the Verizon Cellular network and there is a Z-Wave Radio to allow the full automation that alarm.com offers.
It is an easy as installing and configuring a keypad on a vista panel, we will work on getting a training video for DIY users
Please let us know if you have any other questions, this currently will only work with Vista 15/20 panels, there will be support for other panels in the near future
Mike
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