A good/cheap, portable projector for AR setups...?

''BenQ Joybee GP1 - The projector is tiny, weighing in at only 1.4 pounds. The maximum resolution is 858X600, but it's able to scale anything you throw at it. The projector can display in both 4:3 and 16:9 resolutions, and can also stretch a normal image to widescreen. The bulb-less LED light is bright: 100 lumens, with a 2000:1 contrast ratio. In a reasonably dark room we were able to get a perfectly viewable image, and even moderately light rooms will give you a good result.'' [source]


''Viewsonic PJ106D uses a white LED light source and a .55" DLP chip and can operate for about 2.5 hours when mated with it's portable battery pack. We actually saw the device in action and were impressed.'' [source]


''Portable Projectors - review'' [source]

''EB-450Wi interactive projector, interactive pen, interactive teaching on any surface! Ultra short throw projector, no shadows on the screen!'' [video]

''Samsung P400 Pocket Projector -
The SAMSUNG P400 combines an ultra compact, modern design with advanced features to ensure you make a big impact. Plus, with easy connectivity to your PC and AV devices, youll be up and running fast.'' [video]

Interesting low-tech solution to hang a projector [source]