One of the best is Security APL, Inc . Scrolling down the page, you can find performance graphics for other periods of time. Along with the most recent price, other information appears. You can find a list of companies with dividend reinvestment programs at the Netstock Direct site. In each example, calculate the total profit or loss over the six month period with dollar cost averaging.
Many investors rely upon a company's dividend yield as a guide for selecting companies.
There are a number of excellent sites providing both quotes and company data. We noted the Security APL, Inc. site above. Now try Yahoo Quotes . Enter Mead's symbol, MEA, in the request block and receive the price quote. Another great source of information is DBC Online .