If you want to buy direct, they have an online store. When buying pairs of monos, you have the option to get them in mirror-image - so their signature V-notch can be on the left for one, on the right for the other. That probably looks good if side-by-side, but probably not so good in a rack. In a rack, I prefer having the notch on the same side for all amps in the rack.
http://www.aragonav.com/web-store Price looks like an arm and a few legs. Each.