Hello FPN Group,
Recently I have ordered a Platinum Preppy EF 02 Fountain Pen, Made in Japan, it is a very low cost and is affordable by anyone who wants to test it at-least once. The price in INR is about 350.
The nib is made up of steel and the body is plastic. The grip section, screws off and by default it comes with one cartridge. The only thing troubles is that the cartridge is more expensive, but you once the cartridge is empty you can remove it and can convert it to eye dropper by applying silicon grease.
But one thing I need to say is it writes like a charm.