Yup, shop around, I got one for about $18.00 at a show.
I have an Iwata HP-CS & it fits, but I also have the GREX 'handle' to make the a/b easier for me to use, & it still fits, but loosly, so will eventually modify the a/b rest bit to suit.
Fill the pot with water & a little washing up liquid to give it a bit more weight & make cleaning easier if you are using acrylics. I also use it as a stand while filling the a/b cup, & use Iwata Media as my preferred cleaner.