As of July 2026 · 91 listings tracked across Amazon, Walmart & eBay
Right now the best value is 12¢ per oz — Post Grape Nuts Original Breakfast Cereal, Crunchy Breakfast Cereal 2… (29 oz, $3.39) on eBay. See it on eBay →
Prices change fast and stock disappears faster — YMMV.
The pack-size trapThe biggest pack we tracked (49.9 oz) looks like the bulk play, but it runs 61¢ per oz — the 29 oz pick wins at 12¢ per oz. Bigger isn't automatically cheaper.
Median across all 91 tracked listings: 25¢ per oz. The worst deal we saw ran $1.41 per oz — same product category, 12.1× the price per unit.
The 12-month picture
This is our first month of tracked history for Breakfast Cereal — the trend line starts here.
Lowest we've ever tracked: 12¢ per oz (July 2026).
How we figure this out
Once a month we pull live Breakfast Cereal listings from Amazon, Walmart and eBay, read the honest quantity out of each one (ozs, in this case — the unit that actually matters), and divide the real price by it. Coupons that change what you'd pay today are applied; "subscribe & save" teasers are not. Then everything gets ranked by cost per oz, because a big box with a small number inside is still a small number.