I just noticed some of Fred Bond's 4x5 and 5x7 transparencies (1940s and 1950s Kodachromes) listed for sale on ebay by seller
oldstuff4-u, which can also be found searching for "fred bond trans". In general searching for Kodachrome or Ektachrome transparency or slide on ebay may bring up some old items, though who knows how they were stored. I don't know the original color renditions, though they look like the typical Kodachrome colors to my untrained eye.
Example listings (listed between $65-$125):
Original Fred Bond 4 x 5 Trans. CO Rocky Mt. Nat'l Park, Dream Lake, Hallets P
Original Fred Bond 4 x 5 Trans. NY Niagara Falls, from Goat Island
Original Fred Bond 4 x 5 Trans Indiana Old County Courthouse - Paoli, Orange Co
Original Fred Bond 4 x 5 Trans. So Carolina - Flower Market
Original Fred Bond 4 x 5 Trans. Louisiana NEW ORLEANS
Original Fred Bond 4 x 5 Trans. MS - Vicksburg, view from Mississippi River