Some of these prices are a little rich for my blood, but this label I recently found specializes in gaming OST’s from genres that are kind of all over the place. NES Ninja Gaiden, Arcade King of Fighters '98, Panzer Dragoon…
Similarly, I’ve had some luck on service 7digital. Dan Forden’s Mortal Kombat remastered soundtracks, and Alien Crush / Demon Crush OST is over there, too.
For what it’s worth, some Brave Wave products are available in the Materia Store. https://materia.store/
They’re still pricey there but there are sometimes discounts. Also for what it’s worth I’ve found that CDs are often cheaper than vinyl releases.