Here's another quick and helpful tip from Ann-Lee of the account management team:

Now you can get traffic and cost estimates on search queries without logging into your account. Keep in mind that the estimates this standalone tool provides won't take your individual settings and history into account, while accessing the tool from within an Ad Group of your account will. Learn more or check it out directly! (Note: for easy access in the future, you may want to bookmark that page once you're there.)