Hi, This cactus was actually three stemmed at one time. I had to do surgery and remove one of them and the other two you see are just barely hanging on by a thread. The entire plant had gotten what i believed to be white flies that I got from a basket of petunia's from a florist ! I used iodine on the exposed flesh of the cactus hoping that would save the plant. Too soon to see if that will work or not. Originally this cactus was a single stem with no tapering going to the root. I put the pot on its side to get this picture as there is not enough of the plant bottom to hold it upright. If I had to guess I would say the plant is about ten years old. Its okay with a mild frost but i had another one just like this years ago and a hard frost killed that one, if that helps any with the ID. thanks for any help you can give

Your Bunny Ear Cactus is Opuntia microdasys. Hard to say on your "Light Bulb", but check out Mammillaria parkinsonii to see how it compares. Your unlabeled dollar find looks like a type of Ferocactus to me. Maybe better to ID it when it grows a bit. I think someone gave a common name of Domino to your Echinopsis subdenudata. I do not believe it is a cultivar (no different from the species), but is being circulated as such (sort of a good descriptor for it). I'm curious to see your Mammillaria mystax when it flowers, to confirm that ID.

This maybe a apple cactus it is in the cereus family do a Google search on apple cactus if it fruits if it is an apple cactus u can eat the fruit

Thanks! This is the first time I've done well with plants, so I'm doing my best to learn all I can about cacti and succulents. This pic is actually from a few months ago since it was the only blooming pic I had. That pot does have a drainage hole, but I recently repotted it in a different pot that I wanted to use. There were three pups by that time that I separated, so I have now put those in their own little pots. It's been several weeks, and they are doing well!