You can find this post here on my new site for the full post and to leave comments.
I had been considering buying this same species of cactus (for 7x the price in a 6" pot) a few weeks back but am glad I waited because... Well, 7x cheaper is always a good thing!
It is tiny though, only a 2" pot but it does look a little healthier (It is almost June now though, rather than late March so that might have something to do with that) and space is limited so... Yay! New cactus, low price. May have to wait a few years to see flowers but that's alright.