When we were re-doing our kitchen a few years ago, I managed to secure a laminate for our countertop that had originally come out in the 1950s, had been re-issued 50 years later, then discontinued 3 years prior to my kitchen re-do.
I found a sample if it for sale on ebay, then I called around to various places that had the style of kitchens we like (mid-century modern) and found it.
Sometimes, oddly, etsy has discontinued items for sale. Find some places that sell lots of the brand-maybe some of them have it stashed somewhere.