they exist, that's called Atom. "e-core" is just a rebranding of Atom because the Atom brand is toxic with a huge segment of the tech public at this point, but Gracemont is an Atom core.
There's no Gracemont-based SKUs yet, but Tremont-based Atoms exist (they're in one of the models of NUC iirc), which is the generation before. Also, the generation before that is Goldmont/Goldmont Plus which are in numerous devices - laptops, thin clients, and NUCs.
Keep an eye on the Dell Wyse thin-client series, there are a lot of Goldmont-based units available if you can settle for a (low-priced surplus) predecessor.