IDE cables have changed a lot over the years.
they are in the general category of insulation displacement connectors.
to see it from the manufacturer's point of view, here's one of my personal favorites - Samtec.
http://www.samtec.com/
they should have some .100 centers IDC's in there. but, those are vintage 2012. the .100 centers design has been used for about 30 years. but i would be very surprised if the materials & plating stay the same.
i would keep them grouped according to 'vintage', if that's practical.
some scrap metal dealers will rate it as a #3 copper wire product and give you rates close to Christmas tree lights - about 40 cents a pound.
one option is to cut off the connectors, because some of them do contain gold plating, and to sell the ribbon cable.