Cheapest price I could find this at by using the current favourite voucher code: "bill20".
I know these things aren't popular with a lot of people, but I would like to point out that this model supports full colour stereoscopic 3-D is probably the cheapest way to access full colour stereoscopic 3-D at the moment.
--- Product Description ---
The unique, futuristic Vuzix AV310 Widescreen allows you to watch movies or play video games on your own private display. The lightweight AV310 features twin high-resolution widescreen LCD displays that enable you to view 2D or 3D movies on a screen equal to 52" viewed from 9 feet. The AV310 has an adjustable nosepiece and head strap so it is comfortable to wear for long periods of time, a single lithium AA battery provides 11 hours of 2D video play. The fantastic Vuzix AV310 includes on-screen display controls and removable earphones and is compatible with devices featuring a composite video-out socket. You can convert your tiny video display and enjoy a real widescreen movie experience with the exquisite AV310 wearable display.
- Features twin "high-resolution" 428 x 240 widescreen LCD displays.
- Displays 2D and 3D stereoscopic video.
- 16:9 widescreen and standard 4:3 screen formats.
- Equivalent to 52" screen viewed from 9 feet.
- Can be worn with or without eyeglasses.
- Independent +2 to -5 diopter focus adjustment.
- On-screen display controls.
- Displays 4hrs of 2D video with an alkaline battery or 11hrs with a single lithium AA battery.
- Removable earphones.
- The AccuTilt viewer pivots up to 15 degrees for optimum viewing angle and clarity.
- Adjustable, hypo-allergenic nosepiece.
- Adjustable head strap.
- Carry pouch.
- Weighs less than 4 ounces.