I don't know if this alloy CSX is still for sale, but I don't remember seeing another alloy CSX as inexpensive as this:
http://www.gasholes.com/smf/index.php?topic=15410.0
I've also read here that the early CSX's, built in Las Vegas, are much better than the newer CSX's, but those differences to the best of my knowledge has not been clearly defined. or may have been only related to the fiberglass CSX's.
A very good time to buy one. Good luck.