Yikes, I was thinking more like <$50 for a CP!

So to use the CP as an ND do you just rotate it until it isn't polarising?
Did you go for soft or hard GND?

What diameter is the 50mm f1.4? The f1.8 is 52mm so I assumed the 1.4 would be the same, but if it's 58mm then that means all 3 of my lenses are 58.

Sorry for all the questions!!!