The image doesn't show up anymore but I think that's what it was at the bottom of the page. $17 US I think its listed for. Try emailing them.
Oh and FYI, that decal is not a CSX thing either. First off, CSX's don't have the emblem on them. It just says "Acura" and "CSX" on the back, like ours say "Civic". Second, the CSX's have a 2.0L engine - so those who have bought a badge for their CSX usually get the 2.0L one. If you have an Si that's what I'd get too.
I'm sure a few of the forum sponsors could hook you up too, perhaps College Hills Honda, King Motorsports, to name a few.