Hi, Tony C – I ordered a set on eBay from merchant takak2015. Here’s a link to his shop on US eBay.
https://www.ebay.com/usr/takak2015?_trksid=p2047675.l2559
It took about a week to get them from Japan. You might want to check and see if the merchant is active in the US. I see a current listing for them ($136) on eBay.
It came in shrink wrap. I’ve also seen them listed in a plastic bag like a slide rule might have come in. (Yes, I’m ancient.)