In our Sci-Fi session we had the recurring problem that characters were injured because of bad battle map display.
We figured it would be great to have a set of reusable adjustable walls etc. with which we could build the map (in our case modern apartment blocks).
I went to our local store and asked and got a baffled look as a response. The whole tabletop area in it had nothing that I could use for it and the guy there told me he had never had any requests for that.
So, how do I make such a thing myself?