It was nowhere in the FAQ or anywhere on the site that the $50 (total of $150 off) would be released on 4 month chunks. My understanding by reading everything was that they'd all be available to me at the time of purchase.
I live in the Northeast so I'm probably unlikely to utilize the promo code that is good from January through April 30th, unless I get out for a round in early April (At which point the courses aren't in any good shape anyways)