I start this threat to help myself and others. Something I find difficult to locate materials in Quebec province in Canada. I don't know every stores around me. So I list here what I know. Feel free to add your city/country stores for specific needs.
Quebec Province in Canada
Sial Canada, Laval
Smooth-On products
Oil-based Clay and Wax (All sort of Chavant products)
Sculpting tools
DeSerres, Montreal
Water-based Clay
Sculpting tool
Langevin & Forest, Montreal
Wood blocks and socle
Noble
Kerrlab & Other Waxers
Sculpting Jewelry tool