Made of hardwood and aluminum tubing, they are low cost and durable, allowing them to be reused many times.
Also, using your own utensils over and over again helps reduce the cutting of trees to make new chopsticks (albeit by a very tiny amount).
Step 1: Materials
In the spirit of re-purposing, I used an old Airsoft barrel I had lying around for the tubing. All I needed to do was to wash it thoroughly to remove grease.
Both tubing and dowel can be found at any good hardware store or home center.
You could also cut up an old pair of chopsticks to use in place of the dowel, but I didn't have any.
At my local Ace Hardware (Northern California) you can get materials for four pairs of chopsticks for $7.50.