I've ordered from Polar Pro's website direct. I needed a ND64 for the desert.
Interesting to note they use the USPS as delivery, and I got three notices too: First was "Your item has been shipped" with the tracking number. Second was "Your item is out for delivery today." And third was "Your item has been delivered." Pretty amazing, and I've noticed that USPS has been doing a lot better since they teamed up with Amazon's shipping verses UPS which seems to be the slowest of the lot now for cross-country shipments (i.e. UPS 5 day Ground, and USPS is 3 day.) as well as the most expensive too.
Fwiw, I also found their ND64 (6 stops) to be really neutral in white balance color too (I have a color temp meter.). Their ND16 and ND32 goes towards the blue: 1,000K on the ND32, and 800 K on the ND16. Oddly, their Polarizer ND16 is toward the red side a bit, maybe 500 K.