Yes, 12 bolts holding the ring gear to the carrier.
That IS a high price. Somewhere, if it "says" 12-bolt, the price just goes nutso. At 2.73:1 ratio, it's a paper weight for most.
Not going to find a 12-bolt ANYTHING just lying around a wrecking yard. MAYBE on a "fluke", but they've been scarfed up years ago. Last production was 1970, IIRC.
Jim