All About Arthropods
Pupa
You can check out my new and improved availability list down below and hopefully snag a species or two. 
Availability List

Availability List
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Old substrate as in eggs, larvae, pupae AND adults though; not just adults like a lot of starter cultures. And I've actually made close to $2,000 on these in my three years of working with them already, so I have to remain confident. Thank you for the concern though.I hope you don't find my reply rude, because that's not how I'm intending it, but I don't think you're going to have luck selling "old substrate" of a pest species, including mites, for anywhere near $60. I got a spider beetle starter colony for ... $20 or less including shipping? It was a while back so I don't remember exact cost.