Below are some links to tool makers and suppliers for specialty woodworking and carving tools, with some adze-specific links further down.
Adze Specific Links
Demand for bowl adzes has grown immensely over the last several years, and there have been new makers beyond what I have kept up with. From what I can see — and from what I have heard from others with direct experience — many are very good. I’ll include some links to some makers and suppliers below, not as an endorsement necessarily, but rather just as some helpful possibilities as folks explore and search for adzes.
http://www.mainecoastcraft.com/tool-sales.html U.S. supplier
https://woodsmithexperience.co.uk/shop/category/adzes/ European supplier
Woodland Craft Supplies European supplier
http://www.klensmide.se/ Hans Karlsson’s site
http://www.djarv.se/djarvenglish/startsida.asp Svante Djarv
Nic Westermann Nic Westermann’s site
https://www.facebook.com/Ironramforge/ Iron RamForge
https://www.lucianaveryblacksmith.com/ Lucian Avery
https://www.joshuaburrell.co.uk/product/50-mm-radius-hand-adze Josh Burrell
https://www.etsy.com/shop/kharkivforge Kharkiv Forge
https://jasonlonon.ecwid.com/#!/Adzes/c/21924202/offset=0&sort=normal Jason Lonon
http://www.sevenpinesforge.com/product-category/axes-hatchets/ Seven Pines Forge
Black Bear Forge Black Bear Forge
http://www.kestreltool.com/adzes Kestrel Tools
https://www.northbayforge.com/adz.htm North Bay Forge
Barr Specialty Tools Barr Quarton’s site
Rovtar Forge Rovtar Forge Etsy site
David Fisher, Carving Explorations 