>...so it looks like Amazon has their hands in other areas besides distribution of mass manufactured parts.For your 3 examples, I clicked on "Explore the store" and of the dozen or so random items I clicked on, it was 1 to 3 days delivery. I also found a wooden cutting board that you could personalize with a customer name (laser etching) and that was 3 to 6 business days.
I didn't see any item that said 6 weeks for delivery like Etsy has.
The Princeton Audio article didn't specify but I'm guessing[1] he's using one of these 2 Amazon partner programs:
1) https://vendorexpress.amazon.com
2) https://www.amazon.com/gp/launchpad
This gets you a special Amazon products page with the cachet of "Ships from and sold by Amazon.com" which is more valuable than "Fulfilled by Amazon." Those programs are not appropriate for 2 month lead times.
[1] PA's dedicated Amazon product page which you can no longer reach from Amazon search but Google still had a link: https://www.amazon.com/Princeton-Audio-Site-Tonewood-Bluetoo...