Definitely. In the U.S. at least, there were literally laws in place prohibiting merchants from mentioning credit card surcharges or changing prices accordingly

Definitely. In the U.S. at least, there were literally laws in place prohibiting merchants from mentioning credit card surcharges or changing prices accordingly, although details varied by state. Supreme Court ruled against one a few years ago on a free speech basis [1]. Now more, if not all, are being challenged. [1] https://www.lexology.com/library/detail.aspx?g=c1069ffd-dafb-48a1-af14-b75c908244bf https://www.lexology.com/library/detail.aspx?g=c1069ffd-dafb... (hopefully the link works)