Are you looking into making your own watercolors? Here are some of my favorite pigment suppliers, as well as instructions on binder recipes.
USA:
JUST PIGMENTS (shimmer and chameleon pigments)
PAINT WITH PEARL (chameleon, holo pigments)
MASTER PIGMENTS (natural pigments such as Malachite, Cinnabar etc)
GERMANY:
FRANCE:
WATERCOLOR PAINT MAKING TOOLS, USA:
HOW TO MAKE WATERCOLOR PAINT:
HOW OCRE PIGMENTS ARE BEING FORAGED/PROCESSED: