I have used Jerry's Artarama almost exclusively for watercolor and drawing supplies for 9 years. I order quality professional products and they have always arrived well-packed in a timely manner. This includes large products like full-sheet paper. (A few years back they experimented with sticky cardboard "mailers" which could not be opened without tearing around the supplies stuck inside. I complained immediately, and never saw this style of mailer again.) My orders are precise and complete. When calling them about back-order items, the staff found my order and researched my inquiry promptly. Their prices are competitive; some super buy prices are amazing bargains.
I started with Jerry's as a student; I now take commissions, and teach watercolors and sketching, suggesting Jerrysaratarama as the main source for my students.