As others have mentioned, the Vulcan was a department store entry level bicycle, worth considerably less than the higher end more collectible bicycles of its day. However...
The bike appears to be in excellent and little used condition. If the seller has good marketing skills and patience, then $150.00 to $200.00 is not unrealistic, assuming the bike is road worthy and safe to ride. I doubt the bike would bring much more than that, though.
If the owner is in a hurry to sell the bike, expect fifty to a hundred dollars, if lucky.