I know next to nothing about this, but I’ve been wondering about this sake sampler at Costco, on the basic principle of “Costco stuff won’t be great, but it’s almost always OK, and there’s a range to give me a better idea of what I like”. However, it sounds like you’re a step or two beyond my total beginner stage.
There was another one recommended by @Kalle a while back in the Costco thread, but I haven’t seen that lately.