I tried, before ebay, to sell a load of old National Geographics my Grandparents had left in the garage.
I went to a used magazine store with visions of cash in my head.
The buyer told me my forty year old NGs were selling for a nickel a piece, except for a couple with map inserts which were selling for a quarter.
They are still in the garage.
But, there is now a market for darn near anything via ebay and other such sites. Let us know if you have any luck.
Maybe I can unload those now (much) older NGS.