Have you specifically gone to either a farm show (best imho) or to a good farm supply store/source?
I looked for a few years before I stumbled on a "local" source.
I have read/thought about hemp in lieu of straw in nest boxes; recently rebuilt my nest boxes to be roll away and now use artificial grass (deep bedding using pine chips in coop).
I searched for something affordable but with shipping too much. Then I went to a farm show and found it "down the...