I have the Perkeo “Bad Taste” (red and black) by Kaweco. It’s a nice pen running less than US$20. Plastic body. Probably pretty similar “internals” to the Kaweco Sport. I also have a Lamy Safari-- reminds me of something that might come out of LEGO if they designed fountain pens (without studs).
My favorite fountain pens are the Platinum Preppy line. The cap seals tightly around the nib and keeps it from drying-- a week or so with out use and they start leaving ink on paper immediately. They’re absurdly inexpensive at about US$5.00 and can be converted to an “ink dropper” type or used with a Platinum converter. All plastic design in fun translucent colors.
