Mammillaria elongata 'Golden Stars'
This cactus grows in little columns and tends to grow into a tight clump of stems. It has cute little star shaped spines which are only a little bit pokey. As shown in the last photo, we also have another variant of Mammillaria elongata with smaller spines. (Shown together so you can see the difference.)
Your plant will be similar to the one in the photos.
Part to full sun
Let dry between watering, water deeply
Not as picky about soil, store bought succulent mix is good, especially if you add some sand or perlite/pumice to make it drain a little better
Ships in a plastic pot with soil.