If you have your own favourite suppliers, feel free to link them in the comments section, but please give us a little information about what you like so much (I'm not a fan of advertising, so a review is essential!)
My suggestions are mostly local to me, so I only have suggestions for Canada and America. Please include any overseas locations in the comments!
If you want some idea of my suggestions for what supplies you might want to have for mineral make-up creation, please check out this post for some ideas!
Suds & Scents: Tanna is awesome and she carries a wide selection of really lovely micas. I get my treated sericite mica, spoons, containers, and more from her.
Voyageur Soap & Candle: Love this store. Great micas, great iron oxides, containers, scoops, and more more more! Excellent shop!
Aquarius Aroma & Soap: Monica has started carrying some interesting fillers, and I'm happy because I get to experiment with bismuth oxychloride, magnesium stearate, calcium carbonate, and boron nitride! The little 1 cc spoons are available here, too. Check out the micas and iron oxides.
Soapcraft.ca: Karen doesn't have much in, but what she has is awesome and the prices can't be beaten by anyone in Canada! I love her creamsicle iron oxide and the burgundy is a staple now in my kit! Oh, I see she is carrying orange now! Great selection of iron oxides.
Brambleberry: Anne-Marie is incredible! Great selection of micas and fillers, lovely containers. And her shop, Otion, in Bellingham is worth a stop on your way to Seattle!
TKB Trading: Love the selection of micas here - the best I've found - and the pop micas are worth an investment! Tons of fillers and containers to choose from...you could spend your paycheque here easily.
I know there are other shops out there - share your suggestions in the comments!