The market sets the price for whatever you sell.
What are they worth to you? Do you like the music and will you ever listen to it?
You can list them in an auction with a reserve that makes you feel comfortable to let them go at that price or above.
Be very accurate and descriptive in your ad. You may only get one shot to find the right buyer for them. Some genres sell well and some don't. In this case I don't think that there is anything "special" about the Franklin Mint marketing a compilation of Big Band Hits. I do like this style myself and own quite a few titles.
You can list them with no reserve and sell to the highest bidder and be done with it.
You may also want to contact a locale vinyl dealer/collector/shop and see if they have an interest. Maybe you could trade for something you would listen to or some CD's.
