Btw, the following website is what the BBC has to say about the change of seasons. Doesn't seem to support any of the alternate "theories" being floated on this forum.
Go to http://www.scottrade.com/. there you will find what you need to get started. They feature $7 trades online. The catch is that you have to have sufficient $$ to get started. A rule of thumb is enough $$ for 100 shares.