I am looking for dried coffee cherries on behalf of my brother. He probably wants to encourage a market for them in order to reduce food waste. I'd support that too. Where can you find dried coffee cherries for purchase? I'd be ok buying them in any quantity, including bulk.
Nossa Familia Coffee, a company based out of Portland OR, sells Cascara (i.e. Dried Coffee Husks) from Guatemala.
Hope this is helpful
You can also try Madcap, which currently has Costa Rican Cascara: https://madcapcoffee.com/shop/coffee/cascara/. I've bought it before and enjoyed it.