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Here is the best site I know of to help you put a price tag on your records.
If it is not listed in their site, chances are that it isn't worth anything.
Once you know the value of what you've got, then I say put them up on eBay with reserves set for about 60% of the value. Keep in mind that the buyer pays for shipping in all cases; eBay or other so you don't have to worry about that expense.