Hi Chris,
The book by Chuck Dachis "Radios by hallicrafters" is a must for people interested in Hallicrafters radios. I recommend buying it.
But regarding the S-120A: It was produced 1967-69 and cost new $59.95. Dachis lists it's current value (1999) as $28-55. You might do a look at past eBay sales for the S-120A.
73, Skip Magnuson W7WGM
