I've used Reef Cleaners serval times in the past and they used to be my go-to for CUC critters. However, they no longer offer shipping by USPS Priority Mail for most of their animals like they used to. And, my most recent order was placed around last June or so, and was the first batch of CUC critters I purchased for my newly setup 25 gallon. I didn't notice until it was too late, but I had Vermitid snails growing on the Astrea snails I order from Reef Cleaners, and now my relatively new tank is overgrown with Vermitid snails. I'm not in a huge hurry to be ordering from Reef Cleaners again, but on the other hand now I need some Bubblebee snails
I've more recently ordered CUC critters from
@coralmonsters.judy who's an R2R sponsor, and who has really large and health CUC guys. You can contact her here on R2R, or check out their website:
https://coralmonsters.com/
Hope that helps!