Where can I get an AT&T Color Monitor?

[Mark H. Granoff]

This has probably been asked before, but...

Can anyone point me where I can buy an AT&T color monitor?

Or, if there is a cheaper or better (or both) alternative via a video
card and a third-party monitor, what is it and will it work in the
AT&T 6300?

I've been using the AT&T Monochrome for 3 years now and I'm getting a
little tired of it... :-)

Thanks in advance for any information.