Translate the headline into two numbers
Round only the displayed result, not the intermediate calculation. For 3 for $10, the mathematical unit price is $3.333…; the transaction total remains exactly $10.
| Offer | Effective price | Cash required |
|---|---|---|
| 2 for $7 | $7 ÷ 2 = $3.50 each | $7.00 |
| 3 for $10 | $10 ÷ 3 = $3.33 each | $10.00 |
| Buy 2, save $3; single price $6 | ($12 − $3) ÷ 2 = $4.50 each | $9.00 |
| Buy one, get one free; single price $5.49 | $5.49 ÷ 2 = $2.745 each | $5.49 |
Do not assume the single-item rule
A “2 for $7” sign does not by itself tell you whether one costs $3.50. The retailer may offer the proportional price, display a separate single price, or require the full quantity. Look for “when you buy 2,” “or $X each,” and the conditions in the flyer or shelf label.
Mix-and-match offers also require an eligible set. Similar products, sizes, or flavours may sit beside the offer without participating.
Compare against the useful quantity
Example: the cheaper unit that creates waste
Single yogurt: $3.99
Three for $10: $3.33 each
Household will use two before the date; one is discarded
Usable cost is $10 ÷ 2 = $5 per consumed tub. Buying two singles for $7.98 costs less and avoids waste.
Decision checklist
- Is the promoted quantity mandatory?
- What is the separate single-item price?
- Which sizes and varieties qualify for mix-and-match?
- Is membership, a coupon, or a loaded offer required?
- Can you store and use the full quantity?
- Is the total spend still within this week’s category budget?
Sources
Official sources were retrieved on August 27, 2026. Retailer and government guidance can change.