Stingray has an awesome happy hour and it is not limited to just the bar area. You can enjoy half priced drinks and rolls in the entire restaurant until 7pm.
I went there yesterday and tried the lemongrass infused vodka (yum) and had a bunch of different rolls and the calamari tempura. While it may not be the best sushi in town it is more than decent and cheap, cheap, cheap.
Great place to meet up with friends after work, but expect it to be crowded as more people learn about the smoking deal on happy hour.