Where to buy precious metal clay in portland Oregon?

* Metalliferous: 3952 N Mississippi Ave Unit B,Portland, OR 97227

* Fire Mountain Gems and Beads: 108 NE 10th Ave, Portland, OR 97232

* Rio Grande: 510 NW 11th Ave, Portland, OR 97209

* The Bead Gallery: 1310 NW Hoyt St., Portland, OR 97209