Last week I found one of the best Grocery Game steals ever:
3 boxes of cold cereal, which retail for $3.89 EACH...
The checker stumbled a bit over her words as she said "And Ms. Moothart your total is...um, $1...and you've saved...well. 91%."
(Just to clarify: I bought the cereal separately from the rest of my shopping trip because I thought they were out and asked for a rain check. It turned out they still had some, but they were in a special display elsewhere in the store. So I went through the checkout line again.)