Not quite as primitive, difficult or slow as using friction on sticks.
Just get two lawn mower blade replacement tips heat them to red hot in a fire, if possible hammer them flat (the iron will be a lot softer when it is red hot), and allow to cool in the air.
The iron is now spark ready.
Welcome to the Iron age guys…
The blade tips don’t need to be new so they can be a re-use of a would be discarded item
Conveniently the pieces already have holes drilled in them so you can attach them together with a string/leather strip so you can keep them as a pair.
A with any other spark throwing device you will need to have a tinder birds nest ready to catch the spark.
This fire lighter will last a lifetime and if they get rusty you can just heat them again in the fire to remove the rust.
Alternate uses: could also be used as somewhat crude knives.
Caution: If you are working on or removing any part of a lawn mower blade, make sure the spark plug is disconnected and the blade cannot move.
Place large wooden objects into the path of the blades so in case they move you won’t loose a hand or finger(s). obviously its going to be hard to use a pair of sparking irons if you are missing hands or fingers.
Cost: free if you know where to look, other wise about $10 per pair.