All of the above art supplies are found at Cheap Joe's Art Stuff. When I conduct a workshop, I order the supplies for the participants. I like everyone to use the same materials. I know they won't be disappointed or run into any art material 'frustration' with these carefully chosen goodies :)
Watercolor pencils are the best thing since stickie notes, and 'waterbrushes' are the greatest as you no longer have to worry about toting water and delicate watercolor brushes into the field. I like things simple, but I also like products that give great results. In my opinion, watercolor pencils offer the freedom of exploring water-media without the frustration often associated with traditional watercolors.