They do have FANTASTIC service.
If I may. Your best bet is to make a new thread. In the first post of that thread announce the prize and what number post it will be (i.e. 53, 121, etc.). Someone will post it in the Contest thread and people will come. But they have to know what they're posting for and it should be pre-determined and identifiable. It should be a post number that's not within the next couple of posts so momentum and excitement can build. If there will be multiple winners, identify all the post numbers (in the first post). If the coupon needs to be used in 24 hours (for example), you should post that information in the OP too. Anyway, just my thoughts.
I think the contest is a great idea but I agree make a new post. I have 2 saber touches on the way so I have to wait a bit. I would certainly participate to help others get a great saber!