As of July 2026 · 13 listings tracked across Amazon, Walmart & eBay
Right now the best value is 38¢ per oz — Great Value Peanut Butter and Dark Chocolate Protein Bars, 21.1 oz, 1… (21.1 oz, $7.92) on Walmart. See it on Walmart →
Prices change fast and stock disappears faster — YMMV.
The pack-size trapThe biggest pack we tracked (50.4 oz) looks like the bulk play, but it runs 59¢ per oz — the 21.1 oz pick wins at 38¢ per oz. Bigger isn't automatically cheaper.
Median across all 13 tracked listings: 81¢ per oz. The worst deal we saw ran $4.98 per oz — same product category, 13.3× the price per unit.
The 12-month picture
This is our first month of tracked history for Protein Bars — the trend line starts here.
Lowest we've ever tracked: 38¢ per oz (July 2026).
How we figure this out
Once a month we pull live Protein Bars 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.