If you really want the cup holder you could purchase either an ARS Series 10, Freedom Breeder FB-5, or FB-10 and build your own rack around those hatchling tubs. I do not believe I have seen any other manufactures make this size of tub with a cup holder other than these two companies. There are TONS of videos up on YouTube that instruct on how to build various styles of rack. Some of them are simple and others are pretty in depth. If you are at all handy it is certainly the cheapest way to go.
Check out this thread. This is probably one of the cheapest and easiest to build hatchling racks that I have seen. I am sure with some minor modifications you could customize this style of rack to fit the various tub sizes listed above as well as others. https://ball-pythons.net/forums/show...r-s-Snake-Rack