Don't know if this will help, but here's how I got my 72T, which I think had an even higher msrp than the 73. I called all over the place, asking for what price they'd sell it to me. I found one installer that would give it to me for $699. I took this to my local dealer, who said he would match. Then, I noticed they had a demo model in the finish I prefered and asked how much play it had. He answered that it probably had less than 10 hours use, but that he'd give it to me for $599. He even offered to toss in the Transparent power cable for free. I jumped on the deal.
I guess what I'm saying is that, to the best of my knowledge, Arcam restricts online sales (at least I can't find any), but that you might be able to get a hold of one for a very decent price if you shop around and if you don't mind a demo model.
By the way, I've heard that the 73 is a sonic improvement over mine and it has the advantage of having two outputs, which mine doesn't.