This has happened to me more than once. I've asked for
something at the prepared food counter where everything is priced by
weight, and have been overcharged, sometimes by as much as $5 per pound.
We don't shop at Whole Foods much, maybe three or four times a year. I
could have dismissed it as an isolated incident, but it happened to me
both of the last two times I shopped there. And when I told a friend
about it, she recounted a story of purchasing a salad for $3.99 and when
she arrived home found that she had been charged $15.99 according to the
sticker on the bottom.
Next time you order something at Whole Foods, check to make sure the
price on the label matches the price in the display case.