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Austin’s eBay seller ID can be found at the following link to one of the sets of pins and collars he sells

https://www.ebay.ca/usr/ajkenne4xm3?_trksid=p2047675.m3561.l2559

Griffith Shaving Goods has a good selection and, like Rez, I have bought from Austin. Great service from both.

There are also sellers on ETSY.

Fendrihan and Classic Edge have replacement...