One option is to post them on the Market Place category on the forum. You would need to list them individually.
Another option is to list them with several auction companies and see who bids the best price.
Remember that if you sell, you will need excellent documentation of your title and you will need to know your original value because the IRS may want a capital gains tax.
Best to get your ducks in a row before starting the process or you may get taken advantage of.