20 Items or Less!

-- Checkout at Walmart in Tulalip, Sunday March 30th 2008

It should be fewer, not less. See this webpage, where they write, The words “less” and “fewer” have similar meanings. However, they cannot be used interchangeably. Use “fewer” when referring to an amount that could be expressed as a specific number. Use “less” when making comparisons that do not lend themselves to numeric amounts. Therefore, it's fewer items and less water. Got it? You can probably find this error at your local supermarket - or any supermarket. I have always seen it written with less.