Gasworks / Milandia year pass

Hello, I am a student who is going to be in Zurich till June. I am going to purchase a year pass for Gasworks / Milandia climbing wall and I will resell it when I leave in June. I am looking for some one interested to buy the rest of the year pass (more than 6 month) for maybe half of the price.

Someone who is coming to Zurich about that time or someone whose pass expires in June or so might be interested.

The price is approximated, I haven checked the actual price.