If you want information on pressings discogs and bsnpubs.com can't be beat. (There are also artist specific discography sites.) If you want price trends all of the other sites are useful.
If you want static information that does not reflect the actual market place a printed guide is your best bet.
You want reality look at discogs, figure somewhere between lowest and highest price sold. Prices fluctuate, stuff in 2010 may be less now or more. Ebay is a joke, sellers often bid up their own stuff or have friends do it. It never takes into account who bid up and never paid too.;)
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http://collectorsfrenzy.com
If you want information on pressings discogs and bsnpubs.com can't be beat. (There are also artist specific discography sites.)
If you want price trends all of the other sites are useful.
If you want static information that does not reflect the actual market place a printed guide is your best bet.