I am surprised that more modelers do not add scapels to their knife collection. They are sharpder and thinner than hobby knife blades. There is a believe that they are expensive. This is not true. In many medical uses the blades are replaced after each use, so there is a mass market keeping blade prices low. I just purchased a box of fifty for eight bucks- if you do a thorough search you can often find a hundred for about the same price.
The knives themselves are in same price range, seven to 11 bucks. They are simpler, smaller and lighter than hobby knives.