I don't know if ordering is an option or how their prices compare with your normal source, but I purchased insect frass through Boogie Brew, last year. Theirs may be from soldier flies. It was my first experience with compost teas and I included the frass with other stuff they offer. Are you using it for the chitin content? I'm no authority, but how about crab or shrimp meal?
I'm going to follow along and see what recommendations others here offer up. Good luck!
I haven't researched a detail comparison between frass and shrimp/crab meal, but went with crab meal chitin content to feed the microbes, this year. Just more readily available than for me. There's bound to be differences in uptake and other fertilization values, though.
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