The much anticipated UX31A and UX32VD Ultrabooks from Asus are finally available from Amazon US and . The UX31A, which starts at a very reasonable price, is being marketed by Asus as the ‘Zenbook Prime’ which we’ve been hearing about over the last few months. According to Asus, a Zenbook achieves the ‘Prime’ denotation as long as it has the 1080p IPS display, SSD, and a backlit keyboard. The UX32VD is thus being marketed simply as a Zenbook because it lacks the SSD.