Boots was a UK court case. The Wikipedia article you linked has a note at the top that it mainly refers to British law.
In the US, local laws generally side with the consumer and legally entitle you to the displayed price. There are also federal laws from the FTC act against deceptive pricing.
See some US state laws here:
https://www.nist.gov/pml/owm/us-retail-pricing-laws-and-regu...
a few summaries from https://www.braincorp.com/resources/the-price-must-be-right-...:
>Michigan requires a bonus of 10 times the overcharge amount.
New Jersey’s Retail Pricing Laws mandate that most retail stores clearly mark the total selling price on most items offered for sale. Retailers must also verify the accuracy of their checkout scanners and may face fines of $50-$100 per violation for noncompliance.
Connecticut law requires stores to charge the lowest of the advertised, posted, or labeled price for an item. Customers who are overcharged are entitled to a refund of the overcharge or $20, whichever is greater