Logitech DiNova Edge Keyboard

This one came out around June, 2003.

• PerfectStroke key system - A precision micro-scissors mechanism distributes typing force evenly across key surfaces, making every stroke natural and fluid.
• Stylishly sleek - Laser-cut from a single piece of Plexiglass and set in a brushed aluminum frame, the diNovo Edge makes a bold statement. Only 11 mm thick!
• Elegant charging base - Put your keyboard on display while charging via the slim base/stand. Advanced Li-ion batteries recharge faster and last longer.
• TouchDisc scrolling - A new type of touchpad, the TouchDisc unifies scrolling, selection, and cursor control. Scroll at hyperspeed with a touch of your finger.
• Backlit stealth controls - Hidden hot keys light up at a touch, and fade into the background when not in use. The touch-sensitive volume slider gives you precise, fingertip audio control.

as of 2017-06-04, it's available new on amazon for $600. Buy at amazon

See also: Keyboards with Volume Wheel