Most 3D pens on the market (for example the 3Doodler Create and the Mynt3D) use rods of 1.75mm PLA filament.
This appears to be very similar to the 1.75mm PLA used by a desktop printer. Which is usually much cheaper than 3D pen refills
Has anybody every tried using desktop printer PLA with a 3D pen, and are there any guides\videos available demonstrating techniques for its use?