KC (MR. Barnes?), Unfortunately I don't know where to get them but also am interested in buying some and recommending them to my neighbors. They concentrate the light on the ground and don't waste any lighting up the night sky to contribute to light polution and the denial of dark skies to astrophotographers, romantics, and other endangered species. Maybe they aren't made any longer. I'm about to give up and try to build something for myself using galvanized sheet metal. Not as nice as the kind in your attachment that I am familiar with but better than the ones that put nearly half of the expensive light up in the sky where it can't help you.
Patrick