Ozu Washi in Nihonbashi is a washi seller that was established in 1653. In a corner of the shop with various papers on display is the Handmade Washi Experience Studio where you can experience making paper. You can learn the process of making paper in about an hour. There is no minimum number of people for the experience, but reservations take priority. You can keep the paper you make!
Haibara is a washi shop in Nihonbashi that has been around for over 200 years. They sell various types of washi, from letters sets to kazari fans and paper products. The shop is also for the fact that Takehisa Yumeji, an artist famous for drawing beautiful women in the Taisho period (1912 - 1926) designed many of the patterns for this shop's letter writing sets, envelopes and uchiwas. The ”Jabara (rickrack/zigzag) letter writing set” is the shop's most popular item, with dotted lines at every folding point, and you can just tear off the part you need to use.
Ibasen is a folding fan and uchiwa shop established in 1590. They sell a range of fans with varying uses, such as ”Edo folding fans” made of yukata (casual summer kimono) cloth, ”mai-ogi” used in traditional Japanese dances, and ”kazari (decorative) fans” used as decoration. Also, don't forget the uchiwas with prints of kabuki (classical Japanese dance-drama) actors and famous spots in Japan, that are based on the publications of ukiyoe masters like Utagawa Hiroshige and Utagawa Kuniyoshi.