I hate anything going to the dump.    If you can spare the time, I would list them.    Start with the series sets they are more popular.     It is a lot easier to list dvd's as you can use the prefilled data as long as it matches.   

A good way to keep occupied during covid!   Just do 10 a day say.    Be very accurate in listing postage costs, buyers don't want to pay more than $2.20  postage for a single DVD;    sets are better as you can use the small satchels or boxes for a flat postage fee - buy the satchels or boxes in bulk before you start.

As said above, nothing to lose but your time and effort.