Welcome to the forum Mark.
I’m not affiliated with GHI. But why the prices are high is because people no longer stock them - GHI or anyone. This is the same for any commercial product, not GHI specific. GHI would need to buy a MOQ of the raw components necessary to produce these. They would need to do a special run to create them. They would need to do a special run of packaging them to you. As a small business I am sure you understand that there’s a minimum total cost for doing a job. With a high number of parts to divide that total cost by, you get the per-unit price down (that’s what “volume” does, right?) Now, with a smaller number of parts to sell to you, sure, GHI could offer you a lower MOQ - but the total cost to them is still going to be the same, and they will have the remainder of the MOQ they had to buy sitting on the shelves, costing them money. So either way, you’re going to pay the same total price, unless they think they have some reason for putting another 50+ units on their shelves (doubtful - that’s why they’re discontinued!) as GHI has costs too. So as much as I feel for your situation, I can only suggest you’re going to have to make a call some where in your product’s lifetime what replacement parts you’re going to use - and for your ALFAT, that might be now.