For
It prevents confusion and keeps things fair.
Against
Different costs make different prices reasonable.
Anonymous excerpts, translated where noted.
“It can be annoying that sales and prices don't line up.”
“Smells like a bait and switch or sloppy store management, at the least.”
“Costco.com prices take into account shipping and handling fees not applicable to warehouse purchases.”
“The online side has lower overhead costs, also.”