I was just at the Aquarium Adventure store in Columbus, Ohio and picked up the two rock formations shown below:

Obviously I'll remove the floppy plant, which evidently only stays upright when submerged. I'll repaint to the dark gray colors of my other rock formations (Battlefield in a Box Rocky Outcrops). As for the grass on the base (both pieces have clumps of grass on one side and none on the other), I'm not sure whether to pull it out and keep the base bare, keep as is, or paint the grass clumps with matte medium and dip them in Woodland Scenics coarse turf or some other such foliage stuff to make it appear more bushy. Opinions welcome.
The company's website is here:
https://ca-en.hagen.com/Aquatic/Decorative/Ornaments/12223The smaller one is 5 1/2" x 3 1/4" x 3 3/4" (14.5 x 8 x 9.5 cm), and the larger one is 7" x 3 3/4" x 5 3/4" (18 x 9.5 x 12.5 cm). Apparently Hagen/Marina products are available in the US, Canada, UK, France, and Germany.
Here are a few more I saw at Aquarium Adventure (manufactured by Penn Plax and Exotic Environments, which I also found available on Amazon UK):



