The glasses that Steve Jobs wore were the German Lunor Classic Rund PP which is a pair of round-lensed glasses. I am not sure where to get the exact same glasses as that Steve Jods worn, but you can buy similar ones, like round glasses at any optical stores.
Firmoo stocks glasses which are similar to Jobs' signature eyeglasses to pay tribute to the person who has greatly changed our lives. Ranges from $21- $25. Check out at http://www.firmoo.com/steve-jobs.html.