The way my friend who had the proto type sticks and went to the SU seminar explained it to me was, that when the BM are being raised in the hatchery, their food changes. The pellets they used in their testing was from the last food source at the hatchery. I very well could be wrong, but that is what I was told.
I don't know how much they are going to retail for, but I think it cost me about $5 a piece to build my own. Of course I stole the 3/4" conduit from the Electricians at work. So all I had to buy was the caps and glue. Oops, I stole the glue from work too!
I see the the SU guys claim to have some kinda SONIC tube on theirs. I drilled the top half of my tube with 1/4" holes and angled them down at a 45 deg. angle. Then in the bottoom half I drilled 1/16" holes at 90 deg.
I think this forces the water in and then the scent bleeds out at a slow rate.
It's just my opion on this thing, I could be wrong.