Here are a few recent sales from ebay....not comprehensive but gives you a look at what some films are going for recently....
16mm
Wizard of Oz (IB Tech), 25 bids, 7 different bidders = $4,050.00
The Fun House (Tobe Hooper, 1981), 25 bids = $2,227,51
Star Wars (Scope 1983), 26 bids = $2,025.00
The Graduate (IB Tech/Scope), 23 bids = $1,995.00
Snow White and the Seven Dwarfs (IB Tech), 14 bids, 10 different bidders = $1,962.99
North by Northwest, 16 bids =$1,259.56
Terminator, 25 bids, 7 different bidders = $1,005.00
Wayne's World, 15 bids, 7 different bidders = $942.11
Strange Brew, 34 bids = $906.83
Bram Stoker's Dracula (1992), 18 bids =$881.92
Batman (1989), 19 bids, 6 different bidders = $748.86
The Never Ending Story, = $559.82
Easy Rider (IB Tech), 28 bids = $389.59
Pink Floyd: The Wall (Trailer) = $127.50
Super 8
Magnificient Men In the Flying Machines (5x600 Scope), 16 bids, 6 different bidders = $550.33
Predator- Buy It Now at $548.09
Gremlins (2x600), 23 bids, 14 different bidders = $334.13
Gladiator: Battle of Germania, 24 bids = $223.80
Million Dollar Mermaid, 3 bids, 2 bidders = $176.89
Ray Harryhausen Trailers (120 meters), 12 bids, 7 bidders =$166.71
El Cid, (Abridged version) 33 bids = $153.32
Belstone Fox, 13 bids = $93.87
The Plank (250 meter) = $77.54
Pinewood Studios: Open Day, 11 bids, 4 bidders = $71.87
Hitchcock Trailers (Vertigo, Rear Window), 6 bids, 5 bidders = $66.10
Peace on Earth, 7 bids, 2 different bidders = $53.10
Project the Right Image, 11 bids, 5 bidders = $43.24