Putting a value on an old part like that is impossible as it's all about personal preference and build requirements.
Stick them on e-bay at 99p and I am willing to bet you will not be disappointed with what they fetch...
MTB - 1989 Ritchey Ultra , 1990 Explosif, 2001 Santa Cruz Superlight
Road - 1984 Koga Miyata Gents Racer, 2009 Pegoretti Duende
Wanted - 1" black quill stem with cable stop.
'It doesn't get easier, it just gets faster' - G Lemond " Everything in life's a race mate" - G Farmer