Bench top grain cleaner, sizing screens or ways to clean small amounts of grain?

We sample different grains from across the region from time to time and test them out in our baked goods. Some of the grains come from smaller farms that may lack the equipment for really thorough grain cleaning. We’re a home based bakery and are looking for a way to clean small amounts of grain. We know there are bench top, lab-based equipment used for cleaning, sizing and grading grains as well as hand screens. The hand screens are pretty costly at ~$100 or more each, but they would actually probably work for us at the moment given our small scale.

We’re looking for some options for a smaller, on-demand cleaning process and wondering if anyone else has explored small scale grain cleaning.