Kodak used to sell 100' at 29.99 at B&H and Adorama. That film was Trix made in USA for international market. The USA made for USA was selling at $44.99. a few years ago they stopped selling them and that was the time I started to try foma and forte. I don't know if the Aristra premium 400 film is indeed a left over stock? or kodak decided to re-label that intentional version.
freestyle has marked the 36exp roll quite low -- at 1.99. the 100' can make about 18 36-exp rolls -- that brings each roll = 1.67.