I saw that exact revolver in .45 colt today for $499 at the LGS. I could probably get it for 520 OTD. I'm looking at prices now and I probably should buy it. I passed as I wanted wood grips... heck I can make grips these things have shot up in price the past couple years. My guess is this revolver has hung out at the end of the case for a few years, they haven't checked prices on reorder, and hence have not raised the price. Even GB about the cheapest I find is $500. Plus you have to ship, transfer, pay taxes, etc.
I may go back and get it tomorrow honestly. Don't need to spend the money... but I doubt I'll find a new one cheaper ever and a SAA is a bucket list gun (I actually want a colt but... yeah not unless I do VERY well in my encore career venture).