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If you are looking for a portable A/V projection system that's quick and easy to set up, take down, and transport, you could start with a 111 iNCH diagonal Da-Lite Fast Fold Deluxe front projection screen. The matching Da-Lite case with wheels for the screen is sold separately.
You could pair it up with one of the ViewSonic 1080p DLP projectors with integrated stereo speakers featured in the above slideshow. You'll also need to separately supply or buy some or all of the following extras: a projector stand, Blu-ray Disc player, HDTV tuner/DVR, HDMI cable(s), et cetera.