ArtClick.TV has over 300 videos related to watercolor. Some of the DVDs available are by Charles Reid, Hazel Soan, Joe Francis Dowden, Linda Baker, Geoff Kersey, Birgit O'Connor and many more excellent teachers.
These are usually about $7 - $13 for one day access, but today you can get three days on any one video for $5. When you go to the website, click on Individual Catalog, then choose "watercolor" from the drop-down menu for Media. Be sure to follow the instructions...don't select any videos that are listed as less than $5 or you will be charged the same price. Most of the videos have a short preview.