You can eliminate listings that contain certain keywords or phrases from your search results. Whether that will eliminate all such listings depends on the title and item-specifics each seller uses, though.
To eliminate keywords from your results, put a minus sign or a dash directly in front of the keyword or phrase you want to exclude like this:
https://www.ebay.com/sch/617/i.html?_from=R40&_nkw=harry+potter+dvd+-disk.only+-disc.only
Use punctuation like a period or dash to link keywords that must appear in consecutive order in a keyword phrase or an exclusion phrase. You can also put quotes around keywords or phrases to group them.
There may be category-specific filter options that allow you to choose particular editions or box sets; that may be another way to exclude various disc only options.
