Old Music

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I was getting together some things to sell on ebay today and came across some of my old music that I've collected for many years. I started to search and see if I could get a little more than what I paid for (each piece probably ranged between fifty cents-three dollars) and found many were wort around $5-10. Then I came across a Guitar Method Book that one guy had listed for $180.00's. This got me asking some questions. "Is there anywhere online to look for the value of old music?" "Since there are no ISBN Numbers how to you search to find the year published when it is not listed?" THanks