Chagrin:
wayengineer.com has good prices on shielded inductors. They might even come in on the same boat. The circuit also requires a schottky diode and sub-1-ohm resistor that you might need to order as well.
I scanned the datasheet. It's a .13 ohm resistor which is used for current sense and it doesn't look all that expensive. The diodes and other external parts do not look exotic. If I order those parts in 2 weeks from Digikey or Mouser it will still beat the PT4115s. I didn't see any .13 ohm resistors on eBay that looked worth ordering.