Scanners for Large Negatives?

Ironsides asks: "My family has a number of old negatives that we would like to digitize. While we could spend the cash and have them all turned into prints and scan the prints, we would prefer to scan the negatives directly. One other problem is that several family members scattered throughout the country also have collections that would need to be scanned in and we could not possibly pay to have them all turned into prints. Now, here's the catch: a sizable number (at least 100 hundred, possibly several hundred) are 1:1 negatives that are 4x5 inches in size (yes, these are very old negatives). Now, I've been looking at slide and negative scanners and unfortunately it seems they only go up to 2.3x3.5 inches (6x9 cm). Does anyone know of a high quality scanner that will handle such large negatives?"