"This question will only make sense if you've seen the show.......not that there's anything wrong with that"
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Yes there's a limit of one mispriced item per visit.
Back when quarts were mispriced (and free!) I tried buying one 5w30, 10w30, 10w40, 20w50, and HD30 and then getting them all price-protected. They'd only let me do one even though they were all different UPCs. So I returned the rest.
That would have been one funky mongrel mix of an oil change anyway.
I was at Walmart today and all of the conventional oils from Valvoline, Pennzoil, Castrol, etc. were at $2.12/quart. At that rate I may have to re-think Mobil 1 in the 5 quart jug for under $20...at least while it lasts.
Two weeks ago, I scored the remaining leftover(overlooked clearance stuff) Maxlife Synthetic 5w30s from my Wally's...for $2.41 each(got 6).
Apparently, these qts were on a reg dino Maxlife(priced above) shelf. When time to pay, it rang at $4.56...insisted the "misleading" price posted on the shelf and after some persistence...and voila!