Smaller folding props are what I'm having a hard time finding. The folding blades are 2 grams each. The smaller straight prop is 9X3 and weighs 8.6 grams. Not quite light enough for the OP but could be made thinner with smaller screws. These are all functional props. They're printed lengthwise and hard to break.
The goal is 50" under 250 grams. 167 grams so far. It's designed for a 7 gram Lemmon micro brick, R/E.