It’s not the floor of the NY stock exchange but the buying is brisk in Park City this week as film distributors, filmmakers and acquisitions departments hustle to find the next “Beasts of the Southern Wild.” After the slew of 2013 Oscar nominees that came from last year’s Sundance pool in the best documentary category, it was expected that distributors would have their eyes on the documentaries. HBO Films has just purchased Pussy Riot- the film that chronicles the story of the radical, feminist punk rock band that went to jail after a Moscow performance. This becomes the fifth documentary purchase so far after Twenty Feet From Stardom (Radius), Dirty Wars (Sundance Selects), The Summit (Sundance Selects) and History of the Eagles (Showtime) sold early this week. Michael Winterbottom’s “The Look of Love,” was the first dramatic feature sold so far at Sundance. It premiered last Saturday night at the Eccles Theatre.