Spending $3000 and saving $300 on delivery is not saving money.

It's spending $3000.

You are $3000 less well off.

This is such a basic concept many will violently oppose the idea with rationale such as "well I was going to spend it anyhow" or "Well, those headphones were on the list" or "These CDs were necessary spends and I would have bought them regardless of the saving".