I am looking to book a cash rez for a couple of days. How do I find out if there are any discounts for DVC members? Do I have to call member services or is it listed somewhere on the Member website what days are available for discounted rates
Note that the member discount rates are typically only offered for resorts & dates which are not expected to be filled with members using points. If it's a period of high demand or a very popular resort, chances are no discounts will be available through DVC.
You could try booking villa rooms through normal cash avenues (Disney website, travel agent, etc.) There may be discount codes available for general public, AAA, Visa cardholders, Passholders, etc.