The market sites themselves are the best source. Try the New York Stock Exchange, or NYSE. You can also try CNN, Moneywatch and Quotes for resources, or speak to a trusted broker.
These numbers are always changing, but can usually be found quite easily online. Information on the particular stock you are interested in can also be found in the newspaper or by reading the...
The best stock market quotes are typically found at an official government or high-profile site, such as the NASDAQ webpage. There, you can have more assurance the information you receive is correct.
Here's an answer from someone in San Diego who just asked the question and then went surfing, the web, that is. So you're learning about the stock market like me and you see that there is an after...