That one above is a do it yourself. You buy the cork, (tiles or natural pieces) cut the pieces to fit together, and install. I didn't even know anyone actually sells completed backgrounds of natural cork. The cork definitely isn't cheap though. You can make simulated rock (painted foam) backgrounds though, using the same methods people use to make landscaping and waterfalls. That would probably be cheaper.

zoomed cork - Google Search

How to build a waterfall for a terrarium