I have 2 sets. One with 1978 date codes and a very nice set with 1981 codes. Pm me if interested.
$75 or $150, I even have a nos set, though not for sale. FYI, $100 is common mid grade, they are usually hard crusty tore junk for that. Always with a heavy crease in the middle, no one ever lays them flat, I do.
These bags when still avail at the dealers, were over a hundred dollars. They were never cheap.