What I got today cost $25 for all of them so it was a good deal. I like your new plants!
I find Astrophytum easy enough, I leave them outside in the rain in summer but I use a very fast-draining gravel mix. I found they preferred small plastic pots to clay.
Wow, it was really a good deal, your Sulcorebutia rauschii violacidermis costs 25 dollars plus shipping in my country, I had never seen it in the nursery and apparently here it is very exotic.
As soon as I get a chance I will start buying Astrophytum too, they look beautiful and I have avoided buying for fear of not knowing how to take care of them, thanks for the advice on the pot, it is amazing that it is like that, I would think the clay one would be better but this is why I come to your experience.
I found a page on Facebook of a nursery where they sell very cheap and put a huge amount of cacti and succulents, I even saw peyotes at a very good price, one of these days I will take the risk to see if they are trustable. Because to travel to the nursery I would have to drive over 350 miles haha.
When I had Astrophytum in clay it didn't grow and got root mealybugs and I was surprised it survived. The ones I bought here are very young and small and I paid 3 dollars for all of them. I prefer to buy plants that are young and cheap because many succulents dislike being moved around and the bigger and older they are, the less they like it. This is especially true of mesembs.
The person I got these from told me of a cactus she bought for $420 that rotted 7 days after she got it. I would never take such a chance and cannot afford it anyway, I won't spend more than $15 on a plant. They will take some years to get big but they are more likely to survive if they spend those years in one place in your greenhouse.
In general, I have had good experience buying plants through Facebook sellers but I know that there are plenty of scammers so check the reviews very carefully. It is also true that plants grown 350 miles away might be used to very different climatic conditions and dislike the new environment. If you are patient, you will get what you want locally, at the price you want