What's it worth?!

Got a 4spd trans in a trade a few years back, didn't pay much attention to it as it came with a bunch of other stuff. Anyways, pulled it out and got a good look. It's a '68 RoadrunnerA833 4spd trans, 23spline, and still has the Hurst shifter, handle, knob, and shifter boot. No rods or bell housing though.

I have no use for it, so I figured I'd sell it. What's the going price for these?