Thanks for the info, all. Somebody snapped up the Collector's Source bayonet, which I'm pretty bummed about. The site had only one in stock.
I've since ordered one from Hero Outdoors...and now their site has none listed. I've gotten an order confirmation, but no shipping info. Really hoping I didn't get ripped off. The business reviews are all over the place, but there are some horror stories.
My inner conspiracy theorist says that somewhere, someone figured out that there is a killing to be made selling parts and pieces, bit by bit, as opposed to selling complete units.
"No, no comrade! First you sell rifle, THEN you sell pieces! Put bayonet in pile over there, between cleaning rod pile and cleaning kit pile."
Or, in some demented variation of Enemy at the Gates:
"The one with the rifle shoots! When the one with the rifle gets hit, the next man picks up the bayonet and leaves the rifle where it is!"