My go to pricking iron the last 4 years has been this one from goods japan:
It is actually a stitching chisel but I have never used it as such. I just tap it lightly and make the holes with an awl just like you would with a pricking iron.
The specs on the iron says that it will make holes 4 mm apart resulting in 6,35 spi. I then bought one with 6 teeth and found out that my old iron was wrongly spaced. It actually had around 4,2 mm
