https://www.kickstarter.com/projects/encobertura/battlefield-operation-30-wargame-terrain-scenery
Sharing this because the project is awesome (and they just added an unpainted option if the textures they offer don't match your existing terrain). This might look like a fairly basic terrain Kickstarter, but the plateaus and hills are a *huge* deal - they are one of the few options available to gamers for premade large and robust hills that will handle wear and tear long term (insulation foam might look great but give it a couple years of regular use and its gonna start falling apart in my experience) and really help give you a more three dimesnional looking battlefield (as opposed to the usual super-flat battlefield).
I've pledged for three sets of unpainted plateaus and hills (one set grassy, one winter, and one desert) which I'll be doing up to match some my own collection of neoprene mats, might add some more for some of my less standard mats (lava mainly).