That is, the price tag on the product (or on the shelf beneath it or wherever) may say $1.00, but when you go checkout at the counter, you actually have to pay more than $1.00.
To keep the scope of this question narrow, restrict attention to
- This list of developed countries (IMF's 36 advanced economies)
- Supermarkets
My guess is that the US is the only such country, but I may be wrong.
Related travel.SE questions: Are taxes included in fuel prices? and Why are prices published without tax in the US?