Yearly membership is $90 US, 2015 calendar year membership $50 US.
Sign up now until the end of 2016 calendar year and save. Membership would typically be $140US from now until the end of 2016 ($50US for the last half of 2015 and $90US for all of 2016). However, if you sign up now, membership is only $120US from now until the end of 2016.