Inexpensive calligraphy pen

This Pilot Parallel Pen ($8) comes with two ink cartridges (red and blue), but you can a box of 12 cartridges with different colors of ink for $7.

Here are some videos of talented people using this pen:https://youtu.be/YltKznOa6Y0https://youtu.be/TbQgFbbFCtchttps://youtu.be/oBondidbiRghttps://youtu.be/rpQD0cIv5Z4