Where do you buy discontinued PLCs and automation parts urgently?

I'm researching how people source obsolete/legacy industrial automation parts.



For example: discontinued Allen-Bradley PLCs, Siemens S7-300/S7-400 modules, old HMIs, drives, etc.



When a production line goes down and you need a specific part urgently:



-> Where do you usually look first?

-> How many suppliers do you typically contact?

-> What's the biggest problem: price, availability, lead time, trust/counterfeits, finding the exact revision, something else?

-> Do you usually buy from the same supplier/broker, or compare multiple options?

-> Have you ever had trouble finding a part that was supposedly in stock?

-> For an urgent $1k–$10k+ part, would you consider buying from a marketplace that let multiple specialised suppliers quote on the same RFQ?



Also interested in hearing what would make you NOT trust such a marketplace.
 
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