To massively lower merchant prices in PoE, stack sources of merchant price reduction until you hit 100% or more; in Sanctum-era examples, that can even make prices drop to 0, while going over 100% can glitch into absurdly high costs instead of helping.

What works

  • Combine multiple price-reduction sources on the merchant side.
  • Aim for exactly 100% reduction if your goal is the cheapest possible shop prices.
  • Avoid going past 100% unless you specifically know the interaction, because one reported case caused price underflow and items cost about 42 million Aureus instead.

Practical idea

A simple way to think about it is: if one source gives 50% reduced merchant prices, adding another 50% reduced source can push the price to zero in some setups.

That is the core trick people were discussing when asking how to “massively lower” shop prices.

Important caution

This is about in-game merchant pricing, not player-to-player trade listing.

If you meant trading prices on the market instead of vendor/merchant prices, the fix is different: you usually need to relist items more competitively rather than trying to reduce a shop modifier.

TL;DR

Stack merchant cost reduction, try to reach 100%, and do not overshoot unless you want to risk weird overflow behavior.