The Trillium club has ways for potential students to register for the Advanced driving school programs without any monetary exchange. If you can volunteer, once you have accumulated enough hours, you can simply enroll at no cost. Even cheaper than a $90 lapping day.
You would have to put in a decent amount of time but if cash is the limiting factor its certainly an option. Plus you get to spend even more time around cars! Its a "win-win".
PM me if your interested, I am the volunteer coordinator for the club and would be more than happy to tell you all about the program in more detail.