They do it a couple of times a year I believe. I think they have the same special around Christmas time?
They're good tires! I've ridden with a good many people who run them and they bite hard, even in the south which is saying something (for what it is worth, STT Pros bite just as hard).
60% and they're in the same cost ballpark as other tires.
I bought a set of 37s because we have some nasty mud at times and I wont own another pair. For what they cost a lot of other tires do it better or just as good for a lot less $$