They are easily made. I've made 3 for less than the cost of one that you buy from the internet ($74.95 is the cheapest I've seen). Go to your local hardware store or marine store and they either sell it by the foot or the pre-cut length. I went to ACE and it was $13 for 8ft of 7/8 aluminum tubing. I went to a bicycle shop and bought handle bar barends that tighten onto the aluminum pole at whatever position you desire. The only other thing you need is a 1/4 drill bit to drill holes for the lower shaft to lock in place. This should cost you less than $25, maybe a couple of dollars more if you buy some fancy grips or have to pay more than $3 a foot for the aluminum tubing. When I make the next one I will post pics for those that would like to see the process and end product.
skinard,
http://www.twistedpens.com/