sign in board

I need to find the cheapest electronic way to have people sign in and out when they want to use our conference room.  I know that we can do a shared calendar in outlook but wanted to do something like a touchscreen board on the outside of the room that users can schedule a meeting or look at who has a meeting coming up.  Any CHEAP ways of doing this?  When I say cheap I mean a few hundred dollars.
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Ben HartCommented:
Meeting/Conference rooms are a bane to me at my company.  My ideal setup would be both a room calendar and physical access restricted.  Kinda like the bathroom key that's linked to a board or an old steel rim... There'd be a user like a secretary who'd be the keeper of the key.  If a user wants to schedule the room they create an event on the calendar (with whom the secretary is delegate) then when meeting time comes she allows access to the room.
Do you really need to have the door of the conference room locked or is it enough a schedule that everyone sees?
Why not to buy a tablet with wireless.
You fix it near the door of the conference room.
It has touch screen. You run an app which shows in a table-like the coming events.
You control the app wireless to make the changes and the touch screen users can only see/read but no changes allowed locally.

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