I haven't gotten far enough in my joja run yet to have actually bought the membership (I'm trying to finish a couple of the community bundles) but 1) it's a whole possible path in the game, I have to play it at least once, and 2) autopetters
I'm somewhere around year 8 on my community center save and still haven't found a single autopetter. Apparently I'd need to spend significantly more time in the caverns to get just one autopetter than I had to spend in them to complete the entirety of the perfection tracker. I'm looking forward to being able to buy some from joja.
Oh no, the RNG can be really unfair! I hope you can get find yourself one in the near future on your CC save.
On my CC save, I found a couple but I tended to just bomb my way through the floors iirc. I have yet to find the Elvish Jewellry though, I only found it on the JoJo save.
My hat's off to you for reaching the perfection achievement, congrats!
I'm planning on trying for three autopetters on that save at some point (one for each of my farm buildings) but we'll see how long it takes to get those...