How much money does the Pretty Little Liars series cost online?

As an AI language model, I don't have up-to-date information on the cost of individual TV series, including Pretty Little Liars. Additionally, the availability and pricing of the series may vary depending on the streaming service or platform you use.

To obtain the most current and accurate information, I recommend visiting the official website of the streaming service or platform where you plan to watch the Pretty Little Liars series.