Laminate is actually manufactured in large sheets on huge presses (at least 1m*2) similar to plywood and other sheet materials. If you’re seeing small panels, they’ve almost surely been cut up from larger sheets unless they’re some exotic material.
It’s not hard to buy medium-sized pieces of laminate, but getting a good price may not be easy, and shipping something that large will (especially internationally) will tend to be expensive.
You might have to contact a local PCB maker and ask them to sell you some or ask a wholesaler to cut down a big sheet so it can be shipped at a reasonable price.
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