How much are old national geographic magazines worth?

How much are these old Playboy magazines worth?

• My mom has recently gotten my grandpas old collection of about 30 playboy magazines that are mostly in decent shape and has given me the dates and asked me too look up the prices. Here's the ones we know we have: May 1965, November 1966, February 1967, August 1967, December 1967, January 1968, March 1968, May 1968, July 1968, September 1968, October 1968, November 1968, December 1968, February 1969, April 1969, September 1969, December 1969, March 1970, July 1970, January 1971, July 1972, January 1973, May 1973, September 1973, March 1974, February 1975, December 1977, December 1978, and April 1994. If you know if any of these could possibly be worth anything please say below. 

• Answer:

  with you saying "mostly in decent shape" I wouldnt think they are worth too much, collectors are lookg for good quality editions. have you tried asking www.unique-antique.org they have helped me in the past.