I'm sorry if I'm just not patient enough, but I already sent you guys an e-mail on the 9th of Oct., and I received no response yet, so I'll quote my mail here too, just to be sure. Here goes:
"Hi Telltale Support Team!
I have a problem with applying the "50% off any full-season purchase" coupon code. I tried to purchase Sam & Max Season Two, but when I enter the code and click on "Apply Coupon", I get the following error message: "Sorry, that coupon code is invalid or can't be used for this order!" On the support forum I found the info that these coupon codes should be valid until 2009. Dec. 31., so I have no idea what could be wrong. Please help me solve this issue!"
A little more info: This was supposed to be my first use of the coupon, I didn't bought any other season with it (the only full season I have now is ToMI). I also attached a screenshot of the issue.