I still have the other bad cards. Could it possibly damage them to put them in the camera and try to use the camera to access them and save files?
I wouldn't recommend putting cards in a camera unless I had any important files on them backed up first. I'm thinking more about saving the data than the camera or card.
Could it also possibly damage the camera to try to format the bad cards with the camera?
I suppose anything is possible but I don't believe a bad card could damage a camera or reader unless it was completely shorted internally. Even then I suspect most cameras and/or readers have power protection circuitry, however I cannot vouch for all designs.
Also, could you post a link to a good reader?
Unfortunately I don't have any recommendations since I haven't purchased a stand-alone reader in years, however some of the cards I've purchased have come with readers that seems to work fine. This is the reader (built-in to my ThinkPad) I normally use: <g>