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

ParKoo
24 real nylon brush-tip pens with water-based ink plus a blending pen. The tapered tips make thin and thick strokes for lettering, coloring and small paintings.
Best for: Brush lettering, journaling and small illustrations
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