The elusive UX31A Zenbook Prime appears to have gone on sale without any official launch fanfare from Asus. Amazon is directly selling the ultrabook right now, with a 1.7GHz Core i5 model selling for $1,149.99 and a 1.7GHz Core i7 model at $1,349.99. Both models have a 13.3-inch 1080p IPS display, 128GB SSD, Intel HD 4000 graphics, 4GB RAM, and a backlit keyboard. If those Intel graphics are a sticking point, there's also a $1,299 i7 option that includes an Nvidia GT 620M card — you'll have to forego the 128GB SSD for a 500GB 7200rpm hard drive, though. This is the UX32VD model we saw in non-bootable prototype form last month.
It looks like stock is running pretty low, with wait times of 8 to 9 days for the i5 and Nvidia models, but the i7 unit with Intel graphics is currently available. There's no sign yet of the 11.6-inch UX21A variant, though. Maybe Amazon's brisk business will convince Asus to tell more people about the laptops' availability — or maybe you'll choose to wait for a touchscreen Windows 8 variant.