Especially since PNW (mostly?) Doesn't make their own products - they put their brand on a bunch of generic products that get sold by various different brands,

Especially since PNW (mostly?) Doesn't make their own products - they put their brand on a bunch of generic products that get sold by various different brands, and act as a distributor and marketer. If people want to buy on Amazon for less, somebody else can buy parts from the same OEMs and sell them on Amazon.