I don't know about others but I'd consider the dimensions being critical in making a decision on how much something like this is worth. For price I would be looking at similar competing products already on the market, and then I would approach a large shop that caters to upper end of the market (one of those high priced shops in an expensive suburb) about making some bulk purchases.
I've dabbled in small online ventures catering to "forum people" with products that are in high demand, when push comes to shove most "forum people" baulk at the idea of spending money even after saying they would definitely buy it. Anyways that's somewhat off topic but thought it might be something worth you considering.