@STYLN think of the substrate your going to use and throw a "fifty units" price out. If it's profitable at $15-20, I think you'll get a lot of interest. Post the interest question on the "what I did today" thread with a link to your page or this page. Its seems to be the most watched thread. Beyond $20 I start getting to the, "do I really need it, how often will I use it" thinking. $20 and below falls into the "it would be good to have" thought process.
I would be in for that.