Are Wave boxes "in demand" ?

I have been wanting to try a wave box.... However they are very expensive. It seems strange they should be so expensive for such a simple task. This has my brain churning and I have come up with a very cheap way to do exactly the same thing as any off the shelf wave box at a fraction of the cost. I am thinking it could turn into a money making venture. My question is have wave boxes gone the wayside or are they still in demand?

If you could buy a displacement wave box for $50.00-100.00 (depending on size) would you be interested?
 
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