A fair price is whatever some one is willing to pay.
If you sell them below current market value, you'll probably see the very same magazines re-listed within a matter of minutes or hours, using your photos (since they don't even have possession yet).
Set a high BIN price, if you want the BIN option. Otherwise, let the bidders determine what they're worth.
"Such is the strange way that man works -- first he virtually destroys a species and then does everything in his power to restore it."