They were on sale at the brewery during October but it´s probably been a year since they last landed in the US.
If I had to guess, I say it trades less than Fou and St. Lam, but higher than their regular line-up. I think it is made in pretty small quantities, but isn't as sought after because some people don't like the flowers, and hence, the reviews aren't as strong. I think it is fantastic, especially with year or so to let the flowers mellow. I did a trade with Mamouche that involved Atrial Rubicite and Prairie Bomb (back when bomb was a little harder to come by).
If I was trading one, probably along the lines of Bruery, Darkness, 6 pack Heady etc I´ve traded some for Firestone Walker bottles. That´s from an international trade so I assume it might pull a bit more in a local trade.