They have little value, unless they have something exceptional on them. Depending on your location, you may be able to put them in plastic recycling, or might have to throw them in the trash.

If you have a lot of movie titles, you could list them on craigslist, and maybe get 25 cents for select titles. But I would not expect anyone to take the whole lot.

Craigslist.

have a garage sale? Most are tossed or given away to second hand stores or thrift stores(who will not give you any money for they do not know if they will sell either)

Probably nowhere.

You cannot make up a job and expect someone to pay you to do it.