Yes, It's much cheaper to make it than buy it.
It's not difficult. You cook short grain rice and dress it with a rice vinegar and sugar solution to make it sticky.
You put a sheet of plastic wrap on a bamboo sushi mat, put a layer of rice and a sheet of nori (dried seaweed), and whatever filling you want, and roll it up using the mat.
Edited by Phoenyx - 7/14/12 at 12:39pm