Rarely ever do airline tickets get cheaper as your departure date approaches, especially if you need to fly on a certain date. Budget airlines typically offer low rates as a baseline price, and as these tickets sell, the remaining ones increase in cost. This is very typical in Europe and Australia. If you know when and where you're going, don't wait on an unknown sale. More often than not, your biggest savings come from booking far ahead when you can.
The Internet is the easiest route and might save you some