Geekzoid

WTS SS15 p10-s, size M, 5?/10, night, full pack
$320 shipped CONUS 
Pictures

Small list of retailers I have seen that carry size US12 11bybbs salomon collab shoes: 

https://nomadshop.net/collections/11-by-boris-bidjan-saberi/products/
https://hbx.com/brands/11-by-boris-bidjan-saberi/categories/shoes
https://immense.tw/en/designer/11-by-boris-bidjan-saberi/95/

https://www.brownsfashion.com/uk/shopping/man/boris-bidjan-saberi

Farfetch also seems to have UK12.5 (US13?? dunno if that is correct, currently contacting their support to verify)