Ebay can be a pain, because they may sit there weeks and months on end not selling. I say lump them all together, and see if anyone will bite on them on ebay. The e-reader ones are exploding right now on ebay, and I'm not too surprised, this whole thing got me wanting to finish my original e-reader collection I stopped back in 2003/2004. So, just give it 10 years, when a set of Animal Crossing 4D holographic cards come out, then these should be selling!
Another good place is a local free online site. I found cards on a site called Used(type in your city name) in Canada.
Made sure to meet them at a local coffee shop to be safe. I wished I traded cards with her sooner.