EBAY dude. I've seen them many times.
That's a nice looking wheel but I find them the most annoying to clean compared to my oldest ca. 2005 "flat" 5 spoke and older ca. 2005-6 flat 10 spoke. The one you speak of I call "fluted" and they appeared first in 2007 I think.
Just so you know, you could use the other 18" too. The only difference will be weight. All three of mine have different lbs with the one you have being the lightest and the old 5 spoke being heaviest.
I rotate all 5 into service so I have all matching, but some people don't do that and could use a non matching pattern as long as dimensions are identical 18"x8" and same offset, which is basically any Land Rover lr3 18".