Watercolor Supplies 

Prang Half Pan Watercolor Set 16 colors (good for beginners/general supply)
Tube Watercolors*: (this is a good option too but I think the cost is the same and the kids have to set up their palettes School Smart Palette with Lids- 12 pack)
Permanent Rose, Cadmium Red, Lemon Yellow, Cadmium Yellow, Phthalo Blue, Ultramarine Blue, Burnt Umber, Raw Umber, Burnt Sienna, Raw Sienna
Windsor & Newton Sketchers Pan 12 colors (not too much more expensive than Prang and very high quality can use year to year)
Blick Academic Golden Synthetic Brushes (great quality, a bit more pricey can use year to year)
Blick Scholastic Golden Round Brushes (more economical option)

Faber-Castell Watercolor Pencils 144ct
Faber-Castell Watercolor Pencil Set 12
Strathmore Watercolor Pad 9"X 12" Canson XL Watercolor Pad 11"X15"
Canson XL Watercolor Pad 18"X24
(These are all student grade pads, pages can easily be torn out these links are to 24-30 sheet pads)
Arches Cold Press Paper 22"X30" 5 pack
(very pricey I buy this for Advanced Portfolio class only)