Does anyone know of a place that sells something I can use to stack components, but not directly on top of each other (due to heat issues)? I know I could probably build something myself, but I would rather not go that route.

I'm not sure exactly what you're asking, but Best Buy, probably Circuit City, Office Max, Office Depot probably have lots of component racks you could choose from.
I have one similar to this one

except mine is stand alone, not wall-mount, and mine was 80 bucks not 150. [I was limited because most of the ones I looked at were either too small for my components, or $250.]

Basically I am looking for something very simple, that will still allow my components to stay where they are (on the top of a Shelf, but stacked with some sort of gap between them. Somthing shaped like this


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|____|

If that makes any sense, with one component on top of it, and the other below it, and so on.