hard bags aren't unobtanium, they're just hardtofindium.
I got mine for $100something on feebay, and one had road rash through the side, with a broken hinge. The other was fine. Both were badly weathered.
...so I did what any sane person would do and fiberglassed, bondo'd, and painted.
They do probably come up, but not often. Before I found them, I was planning on getting cortech sport bags, that work in a tribag system, snapping in a tailbag. Very nice system.