I have an idea on the third one because I saw a similar looking one on a cacti site just looking for confirmation I guess. The first two came home with me from the Home Depot greenhouse because they were the only two C&S that look like they were still alive, so I couldn't leave them there to suffer the fate of the rest.
****Edit***
Thanks to Cactus Dude these have all been identified and I will be adding them to my pics here