Hi Judy,
As I'm sure you realize, the value seasons are great times to visit because rates are lower and crowds are smaller.
Generally, the lowest prices can be found from early January to mid-February and mid-August through September. The month between mid-July and mid-August is a secondary value season.
You find specifics on dates and rates on the site for each resort under the heading Room Types and Pricing. Here the link to that page for
Port Orleans Riverside as an example. The drop-down menu on the right of the page shows you rates for all seasons, including peak, regular, holiday and value.
I hope that helps. Enjoy planning your vacation, and let me know if I can do anything else to help. I'm sure you will have a wonderful time, no matter when you visit.
Wilma