Fly Predators - Source Besides Spalding?

Just checking to see if anyone uses fly predators from another source besides Spalding and how that has gone? I have used Spalding for years but last year had a lot of issues with very slow hatching, or not at all, so I’m looking to change. The only other option I know of is Arbico, but maybe there are others?

Arbico has worked for me, for about 20 years. Rarely slow hatching and they will send more.

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