Your situation is a normal finding. Most high volume producers of manufactured sieve size materials arrive at the same conclusion you have.

You'll want to determine the level of output rate you need, since roll crushers come in various sizes and capacities. Because they're a comparatively simple piece of equipment, there'll be a lot of options available from many manufacturers.

For example, the very foundry sand we use to make our molds is produced by a supplier with a homemade roll crusher, using a steel tubing affair for the arbor. We make a sleeve-like wear liner (roll shell) from a high hardness chrome iron material that is rather small in diameter, though long, and it produces at an acceptable rate.

Some of the manufacturers of roll crushers for your needs are: Gruendler Crusher (St. Louis, MO), FFE Minerals USA, Inc. (Bethlehem, PA), and McLanahan Corp. (Hollidaysburg, PA). There's also a substantial used crusher market, and your local equipment dealers should be able to locate something for you. Common aggregate roll crushers such as Cedarapids, Universal or Pioneer could be modified to suit your needs as well.