Note, you will see the option when you log in to get a one month free trial even if you have an existing account. If you have used this offer previously then you may not qualify again.
Editor's Notes & Price Research
Please see forum thread for additional discussion. -qwikwit
I have an existing account and signing up to the free 1-month trial extended my membership by a month. Previously this wasn't allowed if you already had an account
Not sure if it will work for everyone, but give it a shot and remember to turn off auto renew if it does work