My newest cheap fountain pen is the Kaigelu 338. I paid $8.85 for this pen, including shipping, via ebay. Please Forgive the flaky handwriting and poor lighting. in the photos.
This pen wrote beautifully right out of the package. It is a medium nib, which puts down a consistent dark line. There isn’t much shading or flex, so take that into account as regards your own writing preferences. The nib is stainless, decorated with gold, and isn’t bad looking. The pen here is inked with Private Reserve Purple Mojo, and writes smoothly and wet.
The barrel has an area with a marbled design. Mine is in red, but several other colors seem to be available.
This is a very smooth and nice-feeling pen in my hand, but I have smaller hands. It is a short pen at about 4.75 inches/12 centimeters. The section is also small and short, but is very smooth, and has a much smoother transition to the barrel than it appears. I have no trouble writing with this pen, but someone with long fingers or large hands might have issues with it.
Last, but not least, here it is with several other small pens, for size comparison. Kaigelu 338 Fountain Pen on bottom, Parker Vector Fountain Pen in middle, and Kaigelu 353 on top.
After sitting over night, it wrote immediately when I picked it up this morning. Reliable start is my favorite pen feature, and I’ll have to see how well it does over longer periods of time. Hope this was useful to someone out there.