Criers of undercutting are actually the most hypocritical.

Talking about economics 101? Economics 101 actually tells you that in a free market, when you have competitors it is actually GOOD, because it forces the producers to find methods to cut costs and also innovate. Consumers get quality products at attractive prices.

On the other hand as many have said, price setting is actually illegal in most jurisdictions.

Now that is economics 101 for you. Now either find cheaper ways to craft such as gather your own mats, or find another more profitable market/item to sell.