Walking while working on a computer became a necessary and life-changing experience for me in 2010 after a nasty sciatic injury prevented me from sitting in a chair. I got lucky with the purchase of the electric adjustable desk frame from GeekDesk. (Reviewed here.) It cost $549 plus shipping. I saved a fair bit of cash by making a custom top out of a nice piece of birch plywood.
Finding a proper treadmill to fit under the desk was a challenge back then. The first one from Sears, bought on sale, was adequate but noisy. I bought quieter, second-hand machine and blew the motor after a few months. I got lucky on my third purchase with the LifeSpan TR1200 treadmill, specifically designed for walking while working. A small control panel replaces the upright arms and large display on standard treadmills.
Over the past three years, a great variety of treadmills and complete treadmill desks have become available and the technologies have greatly improved. Since you’re buying a tool that will get daily use, spend as much as you can afford. I ended up spending about $1,600 on the desk and treadmill (if you don’t count my two duds).
But think of it as an investment. Slowly walking an average of 4-5 miles per day while typing, talking on the phone, designing pages or cruising the news has provided many benefits. In the wintertime, I turn on a SAD lamp hanging from the ceiling for light and perceived well-being.