Stingray's happy hour menu rocks. They have sushi rolls and appetizers for $4-$5, plus half-priced sake (all sake, which they don't explicitly state on the menu), beer, and wine. I recommend the shrimp shumai dumplings for an appetizer... fantastic.
The sushi was not the best I've ever had, but it's definitely more than acceptable. The Stingray Roll was my favorite. Service was great, and so was the ambiance. I'm excited to go back when the temperatures cool off and we can sit outside and enjoy happy hour for three hours.