What you are looking for are presentation computer monitors.  Gateway
sells some at
http://necxdirect.necx.com/hai/c_catid_search.html?cifilelnk=0001427&nonce=guest
_gate

I also sell 29" and 33" Princeton Arcadia monitors, both 800x600
resolution.  However I appear to be more expensive than gateway at this
time... <sigh>

Anyway, there are a number of resources out there.  If you need higher
resolution you might think about a projector instead, close to the same
cost, larger pictures if needed, flat screen, etc...

-Adam

WF AUTOMACAO - KITS EDUCACIONAIS NACIONAIS wrote:
>
> Do you know who sell?
>
>         Miguel Wisintainer