Contrary to popular opinion, sushi does not mean raw fish. In some countries, the terms sashimi and sushi are used interchangeably. But sashimi is sliced raw meat (usually fish like salmon or tuna) and sushi is a vinegared rice preparation that can have a variety of toppings. In essence, sushi is a combination of rice and sashimi and it does not necessarily have to be raw fish.
edit Video explaining the difference
This short video explains the difference between sushi and sashimi and also shows you what they look like.
Current prices for sashimi and sushi can be found on Amazon.com: