This is because vendors need to price things at their replacement cost. What they sell you a widget for is not what it cost them in materials and labor to make (or buy from their supplier) that widget, it’s what it’ll cost to produce/procure the next one they need to put on the shelf to replace that one.

The main gripe I’ve been getting from my suppliers lately is that none of them actually know what the fuck is going on with the tariff price increases because every day it’s a different number that’s coming out of the dickhead’s mouth. The plan is as ever to just pass the cost along to the buyer(s), but nobody can plan ahead because no one can get a straight and consistent answer on what the added costs are going to be.