How do you elevate a cake like this?

AStyrofoam.

Really?? So do you just put your supports under the styrofoam? And i'm guessing a cake like that can't be pre stacked...right lol ? 

For just the one tier you don't really need to put anything under the styrofoam, but I'm paranoid, so I would put a cake board under the styrofoam disc. And no, don't assemble before delivery.

AThat doesn't look too thick, so you could also stick a few cake drums together and wrap them in ribbon? I've seen that done before, and as long as a couple of wraps are done with the ribbon to hide joins it looks great. Saves having to buy additional spacer blocks too :)

Thanks guys. This is so interesting to me.

APolystyrene cake separator, they usually come 2inches deep. You can dowel straight up through the polystyrene itself so it's very stable. Wrap in ribbon or you can use wired flowers.

AThanks. I'm trying to find a tutorial on it as well.

From experience, use a styrofoam round with a cake board on top and bottom of the styrofoam piece. That way, the supports won't sink into the styrofoam as it sits. Cover it in fondant and you have a beautiful spacer. Best of luck!

.............Polystyrene cake separator, they usually come 2inches deep.............

Naw - looks to me to be only about a 4"x1".  Those you can find those small rounds at the $$ stores.