JusArt
JusArt Water Brush Pens (6-Pack)
Best for: Travel painting, urban sketching and watercolor pencils

Faber-Castell
Twenty dual-tip watercolor markers made in Germany with a brush nib and a 1 to 2 mm fiber tip. The fully water-soluble ink is highly lightfast and will not bleed through the paper.
Best for: Artists who want watercolor markers that hold up for finished work
From the manufacturer's Amazon listing.
JusArt
Best for: Travel painting, urban sketching and watercolor pencils
DOODLE HOG
Best for: Beginners who want watercolor effects without a paint palette