Purchasing old type-specimens

Hey! 

I'm looking to start a collection of old type specimens (basically anything before 1980), and I'm wondering if you have any insights as to where to purchase some? I've been looking a bit on Amazon, but haven't been able to find much. Maybe I'm not using the right key words? :) Or maybe you know of specific sites/sellers or other tips that you can share?

Thanks a lot,
Kasper

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